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This is a partial list of the Britishmarker Air Ministry (AM) specifications for aircraft. A specification stemmed from an Operational Requirement, abbreviated "OR", describing what the aircraft would be used for - this in turn led to the specification itself, e.g. a two engined fighter with 4 machine guns. So for example, OR.40 for a heavy bomber led to Specification B.12/36. Aircraft manufacturers would design and build aircraft which the Ministry then bought for evaluation by the RAF. On very rare occasions, a manufacturer would design and build an aircraft using their own money as a "Private Venture" (PV). This would then be offered to the Ministry for evaluation. If the aircraft generated interest in the Ministry or RAF due to performance or some other combination of features then the Ministry might well issue a specification based on the Private Venture aircraft.

The system of producing aircraft to a specification ran from 1920 to 1949 during which the Air Ministry was replaced by first the Ministry of Aircraft Production (MAP) and then the Ministry of Supply (MoS). The system was applied to commercial aircraft as well - one of the last being the Bristol Brabazon. During the period, over 800 specifications were issued.

Specification designations

Each specification name usually followed a pattern. A leading letter was usually present to identify the aircraft purpose. The codes used included B for "heavy bomber", e.g., B.12/36, P for "medium bomber", e.g., P.13/36, F for "fighter", e.g., F.10/35, and A for "army co-operation", e.g., A.39/34. The second part was a number identifying it in sequence and then after the slash, the year it was formulated, so in the example given above, B.12/36 signifies a specification for a heavy bomber, the twelfth specification of all types issued in 1936. Specifications were not always issued in sequence.

Admiralty specifications were identified by the letter N (Naval), e.g., N.21/45, and experimental specifications identified by the letter E (Experimental), e.g., E.28/39, with training aircraft signified by the letter T (Training), e.g., T.23/31, and unpowered aircraft, signified by the letter X, e.g., X.26/40. The letter G (General) signified a general-purpose aircraft, e.g., G.9/45, with an M (Multi-role) being applied to aircraft intended for more than one specific purpose, e.g., M.15/35.

The letter C (Cargo) was applied to military transport aircraft, e.g., C.1/42, with the letter O (Observation) used for a naval reconnaissance aircraft, e.g., O.8/38 - the letter S (Spotter) used for the more specialised role of naval spotting, i.e., observing and reporting back the fall of naval gunfire, e.g., S.38/34 - and R (Reconnaissance) for a reconnaissance type - often a flying boat, e.g., R.3/33. Special purpose aircraft would be signified by a letter Q, this being used to specify aircraft such as target-tugs, radio-controlled target drones, etc., e.g., Q.32/55.

Sometimes the purpose for which an aircraft is used in service would change from that for which the specification to which it was designed was issued, and so there are some discrepancies and inconsistencies in designation, the Royal Navy in particular liking to specify multiple roles for its aircraft in an attempt to make the best use of the necessarily limited hangar space onboard its aircraft carriers. In this case this resulted in several types designed to specifications originally intended to signify the naval Spotting role also being used for other purposes, e.g., S.15/33, resulting in the Blackburn Shark and Fairey Swordfish, the latter aircraft being primarily utilised as a torpedo bomber. Similarly S.24/37, which produced the Fairey Barracuda, again primarily designed for spotting, the dive bomber/torpedo bomber requirements being regarded as secondary when the specification was issued, but for which roles it was almost exclusively subsequently used, the original spotting requirement having been made obsolete with the introduction of radar.

In addition, some (mostly early) specifications appear to have no letter prefix at all, e.g., 1/21, the Vickers Virginia III.

List of specifications (incomplete)

The names of the aircraft shown in the table are not necessarily those they carried when provided for evaluation as at this point an aircraft would usually be referred-to as the Manufacturer X.XX/XX, e.g., the Avro B.35/46 - this is in addition to the manufacturer's own separate internal designation for the aircraft, e.g., Avro 698. With several manufacturers submitting designs to the same specification this could result in a number of different aircraft with the same X.XX/XX designation, e.g., Handley Page B.35/46, etc.

Upon acceptance of the design(s) the final service names would usually be chosen by the Air Ministry when they placed a production order, in the above B.35/46 cases, where two aircraft were accepted to this specification, Vulcan and Victor respectively.

Upon entering service, in the absence of any already-planned variants a new type would initially have no Mark Number after the aircraft name, being simply referred-to as the Manufacturer Service-name, e.g., the Avro Anson, however upon acceptance of a new variant the previous (initial) version automatically became the 'Mark I', so in the example given, the previous (first) version of the Anson retrospectively became the Avro Anson Mk I upon acceptance of an Avro Anson Mk II. Sometimes planned variants would be later cancelled leading to 'missing' Mark Numbers, or the extent of the changes may have justified given the new variant a completely new name, e.g., the Hawker Typhoon II subsequently becoming the Hawker Tempest, or the Avro Lancaster B.IV & B.V entering service as the Avro Lincoln. Typographical designation of Mark Numbers (Mk.) varied over time and inconsistencies are common, e.g., Mark II, Mk. II, II, etc. Initially Roman numerals were used, changing to Arabic numerals post-World War II, e.g., Supermarine Spitfire Mk I to Supermarine Spitfire Mk 24.

Note 1: where possible Mark Numbers are given here in this list in the form that was used at the time of acceptance. Variations may be encountered due to changes in format/typographical convention over time.

Note 2: due to mergers and amalgamations within the UK aircraft industry sometimes the name of the manufacturer changed over time, e.g., English Electric later became part of the British Aircraft Corporation (BAC), so the English Electric Lightning then became the BAC Lightning; the British Aircraft Corporation itself and Hawker Siddeley (HS) then later merged and became British Aerospace, subsequently becoming BAe (now BAE Systemsmarker). Thus the previously mentioned Avro Vulcan was subsequently referred-to as the Hawker Siddeley Vulcan; similarly, the Blackburn Buccaneer later became the Hawker Siddeley Buccaneer. Where possible, for clarity the aircraft in this list are listed under the ORIGINATING company's name or the name of the manufacturer under which it first entered production.

Specifications within the tables are listed by year of issue and in numerical and alphabetical order. Specifications lacking a letter-prefix or where one is not currently known are listed first at the beginning of each year's entries before those with a letter-prefix.

RAF Specifications (1918–1920)

Spec. Type Designs (accepted and tendered)
Type I Fighter, ABC Dragonfly engine Armstrong Whitworth Ara, BAT Basilisk, Nieuport Nighthawk, Sopwith Snapper, Sopwith Snark
Type II Two seat fighter Bristol Badger
Type III Two seat fighter Austin Greyhound, Westland Weasel
Type IV

Type VI
Twin engined bomber Avro 533 Manchester, Boulton Paul Bourges, de Havilland Oxford, Sopwith Cobham
Type VII Night Bomber Nieuport London
Type VIII Bomber Avro 533 Manchester, Boulton Paul Bourges, Bristol Braemar, de Havilland Oxford, Sopwith Cobham
Type IX Medium bomber de Havilland Okapi
Type XI Heavy bomber Siddeley Sinaia
Type XXI Two seat amphibian fighter Bristol Type 35 , Fairey Pintail
Type XXII Single seat carrier based torpedo bomber (re-issued 1920) Blackburn Blackburd, Short Shirl, Blackburn Swift
Type XXX Flying boat Short Cromarty, Vickers Valentia
Type XXXII Prototype training seaplane (cancelled 1918) - Short Sporting Type produced to this specification
Type XXXIII Four engined long range flying boat Fairey N.4


Spec. OR Type Designs (accepted and tendered)
1/20 None First spec. issued: spares carrier Bristol Type 37 Tramp
2/20 'Interim' single-engine heavy bomber Avro Aldershot, De Havilland DH.27 Derby
3/20 Single-seat deck-landing torpedo-carrier - Spec. superseded by 32/22 (q.v.) Blackburn Dart , Handley Page H.P.19 Hanley
1/21 Long-range bomber - Vimy replacement Vickers Virginia III
2/21 Experimental single-seat convertible biplane/monoplane fighter/interceptor/two seat reconnaissance-fighter aircraft - written for Bullfinch Bristol Bullfinch
3/21 Naval Fleet spotter/reconnaissance aircraft Avro Bison, Blackburn Blackburn
5/21 Light day bomber - DH.9A replacement Fairey Fawn
19/21 Two-seat reconnaissance aircraft - Bristol Fighter replacement Short Springbok
3/22 Two seat fighter/reconnaissance powered by a supercharged engine - Bristol Fighter replacement Bristol Bloodhound
6/22 Naval carrier fighter with interchangeable wheel & float undercarriages using Jaguar or Jupiter engine - Nightjar replacement Fairey Flycatcher, Parnall Plover
7/22 Army reconnaissance aircraft Hawker Duiker
15/22 Fighter/interceptor Armstrong Whitworth Siskin III
16/22 Long range Torpedo Bomber to carry 21 inch torpedo Blackburn Cubaroo, Avro 557 Ava
21/22 Twin-engined amphibian flying boat for civil operations - see also R.18/24 Supermarine Swan
22/22 Two seat fighter/reconnaissance powered by a supercharged engine - Bloodhound three aircraft order - revised from 3/22 (q.v.) Bristol Bloodhound
25/22 Single-seat night interceptor fighter Hawker Woodcock
31/22 4-seat heavy night-bomber Handley Page Hyderabad
32/22 Single-seat deck-landing torpedo-carrier - Spec. supersedes 3/20 (q.v.) Blackburn Dart II
37/22 Three-seat deck landing reconnaissance aircraft - Blackburn/Bison replacement Blackburn Airedale, Hawker Hedgehog
38/22 General Purpose seaplane/landplane Fairey IIID
40/22 Transport aeroplane - civil airliner - larger version of DH.34 de Havilland Highclere
41/22 'Middle East type transport aeroplane' - civil airliner Armstrong Whitworth Argosy, de Havilland Hercules
44/22 Single-engined long-range reconnaissance seaplane - intended for round-the-World flight Fairey Fremantle
B.30/22 Heavy bomber - written for Bugle II production order but Sidestrand also apparently designed to this spec. Boulton Paul Bugle II, Boulton Paul Sidestrand
16/23 None Spotting ship-plane Avro Bison
19/23 Fighter/interceptor - improved Siskin III Armstrong Whitworth Siskin IIIA
21/23 Fleet two-seat torpedo bomber Avro Buffalo, Blackburn Ripon, Handley Page H.P.31 Harrow
23/23 Coastal patrol and anti-submarine flying-boat English Electric Kingston
25/23 Fleet two-seat torpedo bomber/bomber Handley Page H.P.25 Hendon
26/23 Two-seat long-range day-bomber Bristol Berkeley, Handley Page H.P.28 Handcross, Hawker Horsley, Westland Yeovil
28/23 Long-range bomber - Virginia production order Vickers Virginia
37/23 Single-engined fighter/interceptor - improved Grebe Gloster Gamecock
4/24 "Twin-Engined Home Defence Fighter" armed with two 37 mm cannons Westland Westbury Bristol Bagshot
5/24 Advanced landplane, convertible to a seaplane, trainer for RAF and deck-landing trainer for FAA - see also 5A/24 Blackburn Sprat, Parnall Perch, Vickers Vendace
5A/24 Floatplane trainer Vickers Vendace
7/24 'High Powered Single-Seater Fighter Landplane' Avro Avenger, Fairey Firefly, Fairey Fox, Gloster Gorcock, Hawker Hornbill
9/24 Twin engine medium day-bomber - Sidestrand II production order - see also 25/27 Boulton Paul Sidestrand II
12/24 Long-range bomber - Virginia production order Vickers Virginia
13/24 Patrol flying boat Blackburn Iris III, Short Singapore
15/24 4-seat heavy night-bomber - initial production batch of Hyderabads Handley Page Hyderabad I
16/24 Submarine-borne reconnaissance seaplane Parnall Peto
19/24 Three-seat Spotter/Reconnaissance (FAA) /two-seat GP (RAF) aircraft with interchangeable land & float U/C & folding wings Fairey IIIF
23/24 Twin engine civil airliner Handley Page H.P.32 Hamlet
27/24 Twin engine single seat interceptor/night fighter Boulton Paul Bittern
28/24 Day and night fighter - Siskin replacement Armstrong Whitworth Starling
30/24 Two-seat reconnaissance/army co-operation aircraft de Havilland Hyena, Short Chamois, Vickers Vespa
R.18/24 Twin-engined amphibian flying boat - military version of boat ordered to 21/22 Supermarine Southampton
17/25 Naval single-seater fighter of all-metal stressed-skin construction with interchangeable wheel and float U/C powered by Lynx engine Avro 584 Avocet, Vickers Vireo
20/25 Army co-operation aeroplane - Bristol Fighter/DH.9A replacement Armstrong Whitworth Atlas, Bristol Boarhound
23/25 Two-seat day-bomber, reconnaissance & coastal torpedo-bomber Blackburn Beagle, Gloster Goring, Handley Page H.P.34 Hare, Hawker Harrier, Westland Witch
24/25 High altitude bomber - Horsely replacement Blackburn Beagle, Handley Page H.P.34 Hare, Vickers Vildebeest
7/26 Twin-float high-speed monoplane seaplane for 1927 Schneider Trophy competition Short Crusader
10/26 Long-range bomber - Virginia production order Vickers Virginia
12/26 Fast two-seat day bomber of all-metal construction using Rolls-Royce F.XIB engine Avro Antelope, Hawker Hart, Fairey Fox IIM
14/26 Passenger flying boat Short Calcutta
21/26 Naval Fleet fighter - see also N.21/26 Parnall Pipit, Vickers Type 141, Vickers Type 177
F.9/26 None Day and night 'zone' fighter - no design accepted and Spec. superseded by F.20/27 (q.v.) Armstrong Whitworth Starling II, Blackburn Blackcock/Turcock, Boulton Paul Partridge, Bristol Bulldog Mk.I, Bristol Bullpup, Gloster Goldfinch, Gloster SS.18, Hawker Hawfinch, Vickers Type 141
N.21/26 Naval Fleet fighter - see also 21/26 Armstrong Whitworth Starling II, Armstrong Whitworth AW XVI, Blackburn Blackcock/Turcock, Fairey Firefly III, Gloster Gnatsnapper, Hawker Hoopoe, Vickers Type 177
O.22/26 Naval high-speed, two-seat, Fleet fighter/reconnaissance Blackburn Nautilus, Fairey Fleetwing, Handley Page H.P.37F, Hawker Osprey, Short Gurnard
8/27 Long-range bomber - Virginia production order Vickers Virginia
25/27 Twin engine medium day-bomber - Sidestrand II production order - see also 9/24 Boulton Paul Sidestrand II
26/27 General purpose aircraft - D.H.9A replacement Bristol Beaver, de Havilland Hound, Fairey Ferret, Gloster Goral, Vickers Valiant, Vickers Venture, Vickers Vixen, Westland Wapiti
33/27 'Postal Aircraft' - experimental very-long range aeroplane for world distance-record attempt Fairey Long-range Monoplane
B.19/27 Twin engine night-bomber - Virginia/Hinaidi replacement - Hendon winner but introduction delayed so runner-up (Heyford) accepted Avro Ava, Fairey Hendon, Handley Page Heyford, Vickers Type 150, Vickers Type 163, Vickers Type 195, Vickers Type 225
B.22/27 Three engine night-bomber - abandoned due to delays and replaced by B.19/27 (q.v.) Boulton Paul P.32, de Havilland DH.72 Canberra
C.20/27 Transport version of Hyderabad/Hinaidi - Chitral/Clive Handley Page Clive
F.10/27 Single-seat fighter armed with six machine guns Saunders A.10
F.20/27 'Interception single-seat fighter' Armstrong Whitworth Starling II, Bristol Bulldog Mk.II, de Havilland DH.77, Fairey Firefly II, Hawker Fury, Saunders A.10, Vickers Jockey, Westland Interceptor
F.29/27 Fighter utilizing a 37 mm cannon from Coventry Ordnance Works Vickers Type 161, Westland C.O.W. Gun Fighter
R.4/27 Maritime patrol flying boat Saunders Severn
R.5/27 Reconnaissance flying boat Blackburn Sydney
13/28 Long-range bomber - Virginia production order Vickers Virginia
21/28 High-speed mailplane for Imperial Airways Boulton Paul P.64 Mailplane, Boulton Paul P.71A
C.16/28 Bomber-transport capable of carrying 30 fully-armed troops, or their equivalent in cargo or bombs, for a distance of 1,200 mls (1,931 km) nonstop Gloster TC.33, Handley Page H.P.43, Vickers Type 163
F.17/28 Bulldog II production order Bristol Bulldog Mk.II
M.5/28 Torpedo bomber - Spec superseded by M.1/30 (q.v.) Handley Page H.P.41
R.6/28 Patrol/reconnaissance flying boat Short Sarafand
4/29 ab initio trainer - Moth with Gypsy I order de Havilland Moth
9/29 Fast two-seat day bomber - Hart I production order Hawker Hart
13/29 4-seat heavy night-bomber - production batch of Hinaidi IIs Handley Page Hinaidi II
B.10/29 Twin engine medium day-bomber - Sidestrand III production order Boulton Paul Sidestrand III
R.18/29 Three-engined long-range reconnaissance flying boat - military version of Calcutta Short Rangoon


Spec. OR Type Designs (accepted and tendered)
3/30 Basic trainer - Avro 504N replacement Avro Type 621 Trainer
5/30 Mail carrier Vickers Type 166 Vellore II
6/30 ab initio trainer - Lynx-Avro (Avro 504N) production order Avro 504N
8/30 ab initio trainer - Moth with Gypsy II order de Havilland Moth
16/30 Naval fighter - written for Nimrod Hawker Nimrod
18/30 Fairey IIIF replacement Fairey Gordon I
19/30 Naval fighter/reconnaissance with folding wings and interchangeable wheel/float U/C Hawker Osprey
F.7/30 Fighter capable of at least 250 mph and armed with four machine guns Blackburn F.3, Bristol Type 123, Bristol Type 133, Gloster Gladiator, Gloster SS.19, Hawker P.V.3, Supermarine Type 224, Westland F.7/30
M.1/30 Torpedo bomber - Spec. supersedes M5/28 (q.v.) Blackburn M.1/30, Handley Page H.P.46, Vickers Type 207
S.9/30 Two-seat carrier-borne torpedo bomber/three-seat spotter-reconnaissance aircraft Fairey T.S.R.I, Gloster FS.36 ;see also S.15/33
5/31 Long-range bomber - Virginia production order Vickers Virginia
13/31 ab initio trainer with complete freedom for parachute escape by both occupants - D.H.60T accepted with modifications, becoming D.H.82 - see also T.23/31 Avro Type 631 Cadet, de Havilland D.H. 60T Tiger Moth
18/31 Basic trainer - Avro Type 621 Trainer with Lynx engine Avro Tutor
C.26/31 OR.4 Bomber-transport - Valentia replacement Armstrong Whitworth A.W.23, Bristol Bombay, Handley Page H.P.51. Vickers Type 230 - (not built)
G.4/31 General-purpose/torpedo bomber - Wapiti & Gordon replacement - Wellesley one of two designs submitted by Vickers and itself a PV - see also G.22/35 Blackburn B-7, Bristol Type 120, Fairey G.4/31, Handley Page H.P.47, Hawker P.V.4, Parnall G.4/31, Vickers G.4/31, Vickers Wellesley, Westland PV-7
R.19/31 Three-engined long-range reconnaissance flying boat - Rangoon three-aircraft production order Short Rangoon
R.20/31 Twin-engined flying boat - all-metal Kestrel-engined Southampton II (Southampton IV/Scapa) Supermarine Scapa
R.24/31 General Purpose Open Sea Patrol Flying Boat Saunders Roe London, Short R.24/31 Knuckleduster, Supermarine Stranraer
T.23/31 Tiger Moth I production order de Havilland Tiger Moth I
20/32 Three-engined long-range reconnaissance flying boat - improved Iris with Buzzard engines Blackburn Perth
25/32 Basic trainer - revised-Tutor production order Avro Tutor I
B.9/32 OR.5 Twin-engine medium day bomber with appreciably higher performance than predecessors - later revised to specify Goshawk power and subsequently re-revised with Goshawk requirement dropped Vickers Crecy, Handley Page Hampden
B.23/32 Twin-engine medium bomber - written for Heyford I & IA production order Handley Page Heyford Mk. I/IA
P.27/32 Light day bomber - Hart/Hind replacement - see P.23/35 Armstrong Whitworth A.W.29, Fairey Battle, Gloster P.27/32
S.11/32 Naval catapult observation/spotting seaplane for carriage on cruisers Fairey Seafox
13/33 4-engined mail seaplane and 4-engine flying boat carrier - Short-Mayo Composite Short S.20 Mercury, Short S.21 Maia
14/33 Fairey Gordon II production order Fairey Gordon II
18/33 Radio-controlled Fleet gunnery target aircraft de Havilland Queen Bee
21/33 Three-seat general purpose/Army co-operation aircraft - Fairey IIIF/Wapiti replacement - improved Vildebeest Vickers Vincent
24/33 Gloster Gauntlet production order Gloster Gauntlet
25/33 Twin-engined troop and cargo transport - improved Victoria Vickers Valentia
B.29/33 Twin engine medium day bomber with power-operated nose turret Boulton Paul Sidestrand V
F.5/33 Twin-engine two seat turret fighter - later cancelled Armstrong Whitworth A.W.34, Boulton Paul P.76, Bristol Type 140, Gloster F.5/33, Parnall F.5/33, Westland-Hill Pterodactyl Mk.V
G.23/33 General purpose aeroplane - Hart for Middle East Hawker Hardy
R.1/33 Patrol/reconnaissance flying boat Westland-Hill Pterodactyl Mk.VII
R.2/33 Long-range patrol/reconnaissance flying boat Short Sunderland, Saro A.33
R.3/33 Long-range patrol/reconnaissance flying boat - trials order for Singapore III Short Singapore III
S.15/33 Naval carrier-borne torpedo bomber/spotter/reconnaissance (TSR) - Fairey 9/30 (q.v.) design modified and re-submitted as T.S.R.II - Spec. replaces S.9/30 & M.1/30 (q.v.) Blackburn Shark, Fairey Swordfish, Gloster TSR.38
T.6/33 Tiger Moth floatplane two aircraft evaluation order de Havilland Tiger Moth
T.26/33 Tiger Moth II production order de Havilland Tiger Moth II
2/34 High-altitude research aircraft capable of reaching 50,000 ft Bristol Type 138A
16/34 Three-seat general purpose aircraft - Vincent I production order including conversion of outstanding Vildebeests to Vincents Vickers Vincent I
22/34 Close-support aircraft - Audax for SAAFmarker Hawker Hartebees
24/34 Basic trainer - production order for second batch of definitive Tutor design - see 3/30, 18/31 & 25/32 Avro Tutor I
30/34 Twin-engined troop and cargo transport - Valentia I production order Vickers Valentia I
32/34 Navigation trainer - Prefect production order Avro 626/Prefect
A.39/34 Two-seat Army co-operation aeroplane Bristol Type 148, Westland Lysander
B.3/34 Twin-engine night bomber & bomber/transport - Virginia, Heyford & Hendon replacement - transport requirement later removed after protests from manufacturers Armstrong Whitworth Whitley, Handley Page Harrow
B.20/34 Twin-engine night bomber - Hendon production order to this spec - see also B.19/27 Fairey Hendon
B.23/34 Twin engine medium day bomber - Overstrand production order Boulton Paul Overstrand
B.28/34 Twin-engine medium bomber - written for Heyford II production order Handley Page Heyford Mk. II
F.5/34 High-performance fighter with air-cooled engine for overseas (hot climate) use Bristol Type 146, Gloster G.38, Martin-Baker M.B.2, Vickers Type 279 Venom
F.36/34 (modified by F.5/34) Eight-gun fighter with Rolls-Royce PV-12 engine Supermarine Spitfire, Hawker Hurricane
F.37/34 Eight-gun fighter with Rolls-Royce PV-12 engine capable of 350 mph - see also F.36/34 & F.10/35 Supermarine Spitfire
G.7/34 Interim Hart day bomber replacement Hawker Hind
O.27/34 Naval dive bomber Blackburn Skua
P.4/34 Light bomber and close air support aircraft Fairey P.4/34, Hawker Henley
R.14/34 Written for Singapore III production order Short Singapore III
S.38/34 Written for Swordfish production order Fairey Swordfish I
2/35 Naval catapult-launched observation/spotting flying boat for carriage on cruisers Supermarine Walrus
13/35 Naval torpedo-spotter-reconnaissance aircraft - written for Shark production order Blackburn Shark
14/35 Army Co-operation aircraft - Audax replacement Hawker Hector
16/35 Autogyro - written for Cierva C.30/Avro 671 Rota evaluation order Avro Rota
18/35 Twin-engined coastal reconnaissance landplane - written for Anson Avro Anson
20/35 Radio-controlled Fleet gunnery target aircraft - Queen Bee production order de Havilland Queen Bee
26/35 Naval fighter/reconnaissance - Osprey IV production order Hawker Osprey IV
36/35 Trans-Atlantic mail plane de Havilland Albatross
39/35 Twin-engine communications aircraft - Envoy with dorsal turret order for SAAFmarker Airspeed Envoy
B.1/35 OR.19 Twin-engine medium bomber Airspeed A.S.29, Armstrong Whitworth A.W.39, Handley Page H.P.55, Vickers Warwick
B.21/35 Twin-engine medium bomber - written for Whitley II production order Armstrong Whitworth Whitley II
B.27/35 Twin-engine medium bomber - written for Heyford III production order Handley Page Heyford Mk. III
B.28/35 Drawn up for Bristol 142M Bristol Blenheim
B.29/35 Written for Harrow initial production order Handley Page Harrow
F.9/35 Two-seat four-gun turret fighter - Demon replacement Hawker Hotspur, Boulton Paul Defiant
F.10/35 Drawn up for the Spitfire prototype Supermarine Spitfire
F.14/35 Written for Gladiator I initial production order Gloster Gladiator I
F.34/35 Twin-engined turret armed fighter Gloster F.34/35
F.35/35 Very high speed fighter Airspeed A.S.31 (not built)
F.37/35 OR.31 Fighter with cannon Westland Whirlwind, Hawker Hurricane with Oerlikon cannon, Supermarine Type 313
G.22/35 General-purpose day and night bomber and coastal-defence torpedo-carrier - Wellesley production order - see also G.4/31 Vickers Wellesley
G.24/35 General Reconnaissance - Anson replacement Bristol Type 149, Bristol Beaufort
M.15/35 Land-based general reconnaissance/torpedo-bomber Blackburn Botha, Bristol Beaufort
O.30/35 Naval fighter/dive bomber development of Skua (q.v.) Blackburn Roc
P.23/35 Written for Battle I production order Fairey Battle I
Q.32/35 Radio-controlled Fleet Gunnery target aircraft - Queen Bee replacement Airspeed Queen Wasp
10/36 Written for Beaufort production order Bristol Beaufort I
11/36 Interim General Reconnaissance - aircraft later re-named 'Blenheim IV' and 'Bolingbroke' name transferred to Canadian-built Blenheim Bristol Bolingbroke I
17/36 Written for Hotspur initial production order - later cancelled Hawker Hotspur; cancelled
19/36 Naval torpedo-spotter-reconnaissance aircraft - written for Shark additional production order Blackburn Shark
25/36 Written for Skua initial production order Blackburn Skua
26/36 Written for Roc initial production order Blackburn Roc
29/36 Written for Wellington (revised Crecy from B.9/32) initial production order Vickers Wellington I
33/36 Written for Blenheim I production order (Rootes) Bristol Blenheim I
36/36 Written for Lysander initial production order Westland Lysander I
37/36 Written for Walrus additional production order Supermarine Walrus I
42/36 Target tug - order for Henley target tug conversions by Gloster's Hawker Henley III
47/36 Written for Bombay II production order Bristol Bombay II
B.12/36 OR.40 Four-engine heavy bomber Armstrong Whitworth B.12/36, Short Stirling, Supermarine Type 316
B.20/36 Twin-engine medium bomber - written for Whitley III production order Armstrong Whitworth Whitley III
B.30/36 Written for Hampden initial production order Handley Page Hampden I
B.44/36 Written for Dagger-Hampden (Hereford) production order Handley Page Hereford I
F.15/36 Written for Hurricane redesigned for Merlin II Hawker Hurricane I
R.1/36 OR.32 Small reconnaissance flying boat Saro Lerwick, Blackburn B-20
P.13/36 OR.41 Twin-engined medium bomber for "world-wide use" introduction delayed due to production difficulties necessitating further order of Whitley & Wellington Avro Manchester, Handley Page H.P.56, Vickers Warwick with Rolls-Royce Vulture engines.
S.41/36 Three-seat torpedo/spotter-reconnaissance aircraft - Swordfish replacement Fairey Albacore
T.6/36 Advanced monoplane trainer mounting manually-operated dorsal turret - Don accepted but proved unsuitable de Havilland Don, Miles Kestrel
T.23/36 Multi-role crew trainer Airspeed Oxford
T.40/36 OR.44 Development and production of a trainer version of the Miles Hawk Miles Magister
2/37 Written for Blenheim I production order (Avro) Bristol Blenheim I
6/37 Twin-engine VIP transport aircraft - order for The King's Flight Airspeed Envoy
19/37 Written for Manchester I production order Avro Manchester I
20/37 Written for Roc floatplane production order Blackburn Roc
32/37 Written for Halifax initial production order Handley Page Halifax I Srs 1 - I Srs 3
37/37 Magister I production order Miles Magister I
38/37 Three-seat communications aircraft & instrument/wireless trainer Miles Mentor
42/37 Specification for wooden mockup of Miles X2 large transport aeroplane - not built - lead to Miles M.30X Minor scale testbed Miles M.30X Minor
43/37 Engine testbed Folland Fo.108; designs also tendered by General Aircraft & Percival
B.32/37 OR.44 Production contract for a four-engine version of the P.13/36 H.P.56 design Handley Page H.P.57 Halifax
F.9/37 OR.49 Twin-engine day/night fighter Gloster G.39
F.11/37 Twin-engine two seat day & night fighter/ground support Boulton Paul P.92
F.18/37 Heavily armed interceptor armed with 12 x 0.303 mg and capable of at least 400 mph Bristol F.18/37, Gloster F.18/37, Hawker Tornado, Hawker Typhoon, Supermarine Type 324, Supermarine Type 325
Q.8/37 Radio-controlled Fleet Gunnery target aircraft - Queen Bee replacement - role subsequently carried-on by Queen Wasp - see Q.32/35 Airspeed A.S.37 (not built)
S.23/37 OR.52 Four-engine carrier-based Fleet shadower/follower - low-speed, high-endurance, ship-tracking aircraft - requirement later rendered obsolete due to introduction of radar Airspeed AS.39, General Aircraft GAL.38
S.24/37 OR.53 Naval torpedo/dive-bomber, reconnaissance - Supermarine entry featured variable-incidence wing Supermarine S.24/37, Fairey Barracuda
T.1/37 Basic trainer Heston T.1/37 Trainer, Miles M.15, Parnall Heck III, Airspeed A.S.36 (not built)
14/38 Long-range pressurised high-altitude monoplane transport/airliner (Shorts) - 3 prototypes ordered, construction started - cancelled Short S.32
15/38 Long-range monoplane transport/airliner (Fairey) - Fairey FC.1, 14-aircraft production order - cancelled Fairey FC.1
16/38 Trainer - Master I production order Miles Master T.Mk.I
20/38 Communications aircraft - Vega Gull order Percival Vega Gull
21/38 Communications aircraft - Dominie production order de Havilland Dominie
24/38 Twin-engine communications aircraft - Envoy production order Airspeed Envoy
25/38 Twin-engine communications aircraft Percival Petrel
26/38 OR.65 Three-seat wireless or navigation training aircraft with dual controls - Vega Gull adapted for communications training Percival Proctor I
28/38 OR.66 Two-seat helicopter - written for Weir W.6 Weir W.6
B.9/38 Twin-engine medium bomber of simple construction using materials other than light alloy wherever possible see B.18/38
B.18/38 Twin-engine medium bomber of mixed wood/metal construction Armstrong Whitworth Albemarle
O.8/38 Naval carrier-borne fighter/observation - winner developed from Fairey's earlier P.4/34 entry Fairey Fulmar
S.7/38 Naval catapult-launched observation/spotting flying boat - Walrus replacement Supermarine Sea Otter
S.22/38 Naval helicopter Cierva C.41 Gyrodyne
T.29/38 Twin-engine R/T (Radio Telephony) training aircraft - Dominie three aircraft order de Havilland Dominie
19/39 Twin-engine transport aircraft - order for Hertfordshire later cancelled de Havilland Hertfordshire
20/39 Twin-engine communications aircraft - order for No. XXIV Squadron RAF de Havilland Flamingo
21/39 Twin-engine VIP transport aircraft - order for The King's Flight de Havilland Flamingo
B.1/39 Four-engined heavy bomber Avro Lancaster, Handley Page H.P.60, Short S.34
B.23/39 Very high altitude version of Wellington capable of operating at 40,000 ft Vickers Wellington V
E.28/39 Experimental aircraft using Whittle jet-propulsion with provision for 4 x 0.303 machine guns Gloster E.28/39
F.17/39 Long-range fighter development of Bristol Beaufort - written for Beaufighter Bristol Beaufighter
F.18/39 Fighter - Hurricane/Spitfire replacement Martin-Baker M.B.3, Martin-Baker M.B.5
F.22/39 OR.76 Fighter fitted with heavy-calibre nose-mounted gun Vickers 414 Vickers Type 432 - also tests with Vickers Type 439 testbed - specification later cancelled
N.8/39 Naval two-seat carrier-borne fighter - Roc replacement - replaced by N.11/40 see N.11/40
N.9/39 Naval two-seat carrier-borne fighter - Fulmar replacement - replaced by N.11/40 see N.11/40
R.5/39 Long-range patrol flying boat - Sunderland replacement - superseded by R.14/40 (q.v.) Saunders-Roe S.38 - later cancelled
T.34/39 Advanced trainer Airspeed Cambridge - later cancelled


Spec. OR Type Designs (accepted and tendered)
17/40 Very high altitude bomber - Wellington V production order Vickers Wellington V
B.1/40 OR.78 Twin-engine fast bomber carrying no defensive armament de Havilland Mosquito
B.3/40 OR.80 High speed bomber Blackburn B.28
B.6/40 Twin-engine day/close support bomber - later renamed Blenheim V Bristol Bisley
B.20/40 "Close Army Support Bomber" with Merlin engine able to dive bomb and photo-reconnaissance De-navalised version of Fairey Barracuda offered but specification not proceeded with.
E.28/40 Experimental research aircraft for deck landings - cancelled 1943 Folland Fo.116 (not built)
F.1/40 Air Observation Post (AOP) Fane F.1/40, General Aircraft GAL.47
F.2/40 Fighter using Whittle jet-propulsion (Metrovick) - written for Meteor - see also F.9/40 Gloster Meteor II
F.4/40 High-altitude fighter - superseded by F.7/41 (q.v.) Westland Welkin
F.9/40 Fighter using Whittle jet-propulsion (Rover/Rolls-Royce) - written for Meteor - see also F.2/40 Gloster Meteor I
F.16/40 High-altitude fighter Vickers Type 432
F.18/40 Night fighter version of Mosquito de Havilland Mosquito NF.II
F.19/40 Low-cost emergency production fighter Miles M.20/2
F.21/40 Fighter version of Mosquito de Havilland Mosquito F.II
F.29/40 Twin-engined night fighter
N.5/40 Naval 2-seat Fleet fighter Fairey Firefly
N.11/40 Naval single seat Fleet fighter powered by Napier Sabre - see also S.8/43 Blackburn Firebrand F.I, Hawker P.1009 "Fleet Fighter"
R.14/40 OR.91 Very long range reconnaissance flying boat - Centaurus-engined Sunderland replacement Saunders-Roe S.41, Short Shetland
S.12/40 Naval catapult-launched observation/spotting flying boat - Walrus & Sea Otter replacement - superseded by S.14/44 (q.v.) Supermarine Type 381
T.24/40 Training aircraft Airspeed A.S.50 (not built)
X.10/40 Troop-carrying glider capable of carrying 7 troops General Aircraft Hotspur I; cancelled after eighteen built - redesigned Hotspur II relegated to training - see X.22/40 & X.23/40
X.22/40 Troop-carrying training glider - Hotspur II production order General Aircraft Hotspur II
X.23/40 Troop-carrying training glider - Hotspur II further production order General Aircraft Hotspur II
X.25/40 OR.98 Troop-carrying glider capable of carrying 14 troops Slingsby Hengist
X.26/40 Troop-carrying glider of wooden construction capable of carrying between 24-36 fully armed troops Airspeed Horsa
X.27/40 Tank-carrying heavy glider capable of carrying 7-ton load General Aircraft Hamilcar
12/41 Target tug Miles Martinet
B.2/41 Twin-engine bomber - Blenheim replacement - requirement exceeded by Mosquito and Buckingham relegated to courier/transport duties Bristol Buckingham C.1
B.5/41 OR.106 Pressurised high-altitude bomber - evolved into B.3/42 (q.v.) Pressurised version of the Vickers Warwick III
B.8/41 Four-engined heavy bomber - see also B.3/42 Short S.36, Vickers Windsor
B.11/41 High-speed high-altitude unarmed bomber de Havilland DH.99, Hawker P.1005, Miles M.39
E.6/41 Experimental jet fighter - DH Spider Crab de Havilland Vampire
F.4/41 Spitfire with Griffon engine - written for Spitfire IV but amended to include Mk. XXI redesign. Preceded in introduction by Mk.s XII & XIV - some overlap with F.1/43 (q.v.) Supermarine Spitfire XXI
F.7/41 OR.108 High-altitude fighter - revised from F.4/40 (q.v.) Vickers Type 432, Westland Welkin
F.10/41 Written for Hawker Tempest Hawker Tempest
N.1/41 Naval fighter Miles M.20/4
T.9/41 Four-seat radio trainer. Percival Proctor IV
X.3/41 Emergency Tallboy-carrying conversion of Horsa for attack on Tirpitzmarker - later cancelled when Lancaster was modified to carry Tallboy Airspeed A.S.52 Horsa
5/42 Glider for RAAF de Havilland Australia DHA.G2
B.3/42 OR.115 High-performance long-range bomber Vickers Windsor
B.27/42 Halifax development aircraft Handley Page Halifax
C.1/42 Interim transport aircraft - cargo version of Lancaster - York I production order Avro York I
E.5/42 Experimental single-engined jet fighter - later cancelled - see E.1/44 Gloster GA.1
E.6/42 Experimental lightweight Tempest - written for Tempest Light Fighter - refined & re-issued as F.2/43 (q.v.) Hawker Fury - see F.2/43
F.6/42 Single-seat fighter Boulton Paul P.99, Boulton Paul P.100, Hawker Type P.1018, Hawker Type P.1019, Hawker Type P.1020, Folland Fo.117a, Miles M.42, Miles M.43, Miles M.44
H.7/42 Torpedo bomber - Beaufighter replacement Bristol Brigand
Q.9/42 Twin engine target tug - planned production of Monitor later cancelled - see also Q.1/46 Miles Monitor TT Mk.1
R.8/42 OR.118 Long-range patrol/reconnaissance flying boat - Sunderland with Hercules engines Short Sunderland IV/Seaford
20/43 OR.142 Two-seat training glider suitable for ATC cadets Slingsby Kirby Cadet TX Mk.1
29/43 Airliner version of Lancaster IV - see also B.14/43 Avro Tudor
A.17/43 Army liaison and VIP transport aircraft - Messenger I production order Miles Messenger I
B.14/43 Heavy bomber for Far East Avro Lincoln, Handley Page H.P.65
B.27/43 Heavy bomber - bomber version of Hastings Handley Page H.P.66/Hastings B.1
C.18/43 Stop-gap airliner version of Stirling Short S.37 Stirling
E.16/43 Experimental helicopter with powered tilting hub controlled rotor with automatic collective pitch control, and torque reaction control using jet efflux. Cierva W.9
E.24/43 Experimental jet research aircraft capable of 1,000 mph and able to reach 36,000 ft in 1 and 1/2 minutes Miles M.52; cancelled 1946
F.1/43 OR.120 Development of Spitfire with Griffon & laminar flow wing - see also N.5/45 Supermarine Spiteful
F.2/43 Written for Tempest Light Fighter Hawker Fury; cancelled at conclusion of hostilities.
F.9/43 Two-seat high-altitude night fighter Westland Welkin NF.II
F.12/43 Long-range fighter for Far East - written for Hornet de Havilland Hornet
F.19/43 Folland design to be built by English Electric
N.4/43 OR.113 Carrier-based fighter - Seafire with Griffon engine Supermarine Seafire XV
N.7/43 Carrier-based fighter - revised as N.22/43 (q.v.) Hawker Sea Fury
N.22/43 Revision of N.7/43; carrier-based fighter Hawker Sea Fury
O.5/43 Torpedo bomber - Barracuda replacement Fairey Spearfish
Q.10/43 Radio-controlled Fleet Gunnery target aircraft - Queen Wasp replacement Miles Queen Martinet
S.8/43 Naval single seat Fleet fighter capable of carrying rocket, torpedo or bombs - Firebrand powered by Centaurus - see also N.11/40 Blackburn Firebrand TF.III
S.11/43 Naval carrier-borne attack/strike aircraft - later cancelled - Sturgeon also submitted to Q.1/46 & M.6/49 (q.v.) Armstrong Whitworth A.W.54, Short Sturgeon
S.28/43 Firebrand replacement Blackburn B-48 YA.1/Firecrest
T.13/43 Advanced trainer Bristol Buckmaster
T.21/43 Trainer version of Spearfish Fairey Spearfish T. Mk 1
T.23/43 Trainer - all-weather fully aerobatic three-seater Percival Prentice
TX.3/43 Two-seat side-by-side seating training glider General Aircraft G.A.L.55
2/44 Brabazon Committee Type I Long range transatlantic airliner Bristol Brabazon I, Miles X-15 (not built)
16/44 Stop-gap airliner version of Lancaster Avro Lancastrian C.Mk 1
18/44 Brabazon Committee Type Va Civil feederliner Miles Marathon
22/44 Transport aircraft - mixed passenger, freight/passenger or all-freight high-payload/short-distance - see also G.9/45 Bristol Wayfarer/Freighter
C.3/44 Long-range general-purpose transport - York replacement Handley Page Hastings
E.1/44 Experimental Nene-powered jet fighter Gloster GA.2
E.6/44 Written for Saro SR.44 flying-boat jet fighter Saro SR.A/1
E.9/44 Flying wing jet bomber/airliner Armstrong Whitworth A.W.52
E.10/44 Experimental Nene-powered jet fighter - Jet Spiteful see N.5/45
F.13/44 Long-range fighter with Eagle 22 piston engine capable of accepting a turboprop at a later date - RAF version of N.11/44 (q.v.) - see also N.12/45 Westland Wyvern, Hawker P.1027/P.1030
N.5/44 Naval carrier-version of Hornet de Havilland Sea Hornet
N.7/44 OR.167 Carrier-based fighter - navalised version of Spitfire F Mk.21 Supermarine Seafire F Mk.45
N.11/44 Naval long-range carrier-based fighter with Eagle 22 piston engine capable of accepting a turboprop at a later date - RN version of F.13/44 (q.v.) - see also N.12/45 Westland Wyvern
N.15/44 Naval carrier-version of Mosquito de Havilland Sea Mosquito TR.33
S.14/44 Naval land-based ASR Supermarine Seagull ASR-1
X.4/44 Tank-carrying heavy glider capable of carrying 7-ton load and returning under its own power General Aircraft Hamilcar X
A.2/45 Army Air Observation Post (AOP) - replacement for Taylorcraft Auster AOPs Auster A.2/45, Heston A.2/45
A.4/45 Army three-seat light communications aircraft - Leonides-powered Pioneer II later accepted 1950 Scottish Aviation Pioneer I
B.3/45 Two-seat twin-engine high-altitude fast jet bomber carrying no defensive armament - Mosquito replacement - revised from E.3/45 (q.v.) English Electric Canberra B.1 - see also B.5/47
C.15/45 Long range transport aircraft Handley Page H.P.72
E.1/45 OR.207 Experimental aircraft for research into proposed tailless configuration of early DH.106 Comet airliner design de Havilland DH.108
E.3/45 Experimental two-seat twin-engine high-altitude fast jet bomber carrying no defensive armament - Mosquito replacement - reissued as B.3/45 (q.v.) English Electric Canberra
E.11/45 Experimental aircraft for research into low-speed handling and high Mach number flying of tailless designs - two examples of Swallow (one low- and one high-speed) ordered - see also E.1/45 de Havilland DH.108
N.5/45 Naval carrier-borne fighter - Seafang developed to this spec. but supplanted by Nene-powered, Naval version of E.10/44 (q.v.) Supermarine Attacker, Supermarine Seafang
N.12/45 Long-range carrier-based fighter - Wyvern with Python turboprop engine - see also F.13/44 & N.11/44 Westland Wyvern S.4
N.21/45 Naval carrier-borne two-seat night fighter de Havilland Sea Hornet NF.21
G.9/45 Military transport aircraft capable of carrying a 3 ton load into jungle areas - see also 22/44 Bristol Wayfarer/Freighter
GR.17/45 OR.220 Carrier-borne ASW Blackburn B-54/B-88, Fairey Gannet
Q.19/45 OR.204 Mosquito target tug de Havilland Mosquito TT.39
T.7/45 Three-seat advanced trainer using turboprop engine - Harvard replacement - replaced by T.14/47 (q.v.) Avro Athena T.1, Boulton Paul Balliol T.1
2/46 Brabazon Committee Type I Long range transatlantic airliner - Brabazon II (Coupled Proteus) order Bristol Brabazon II
26/46 Brabazon Committee Type II Short-range feederliner - Dragon Rapide replacement de Havilland Dove
B.14/46 OR.239 Four engine jet heavy bomber - later used as insurance against delay of aircraft submitted to B.35/46 Short Sperrin
B.35/46 OR.229 Four engine swept-wing jet heavy bomber with a cruising speed of 500 kt and a ceiling of at least 55,000 ft Armstrong Whitworth A.W.56, Avro Vulcan, Bristol Type 172, de Havilland DH.111, Handley Page Victor, Short PD.1; Designs also submitted by Vickers & English Electric
C.3/46 Medium-range tactical transport General Aircraft Ltd. 65 Universal Freighter
C.16/46 Brabazon Committee Type IIB Short-medium range turboprop airliner carrying 24-30 passengers Armstrong Whitworth A.W.55 Apollo, Handley Page H.P.76, Handley Page H.P.77, Handley Page H.P.78, Vickers Viscount
E.4/46 Experimental gyrodyne Fairey Gyrodyne
E.19/46 Experimental helicopter for crop spraying Cierva Air Horse
E.27/46 Experimental aircraft for investigation into delta wing characteristics at transonic speeds Boulton Paul P.111
E.34/46 Bristol Sycamore
E.38/46 Experimental aircraft for investigation into the controllability and stability of swept wings at low speeds. Hawker P.1052
E.41/46 Experimental swept-wing version of Attacker - evolved into Swift Supermarine 510, Supermarine Swift
F.43/46 Interceptor using Rolls-Royce AJ.65 or Metrovick F.9 axial engines - superseded by F.3/48 (q.v.) Gloster P.234, Gloster P.248, Gloster P.250, Hawker P.1054
F.44/46 Two-seat twin-engined night/all weather fighter see F.24/48 & F.4/48
N.3/46 Cierva Air Horse
N.7/46 Naval carrier-borne interceptor/fighter bomber Hawker Sea Hawk
N.11/46 Two seat trainer version of Sea Fury Hawker Sea Fury T.20
N.40/46 Naval carrier-borne jet fighter - see also F.4/48 de Havilland DH.110
Q.1/46 Naval target tug de Havilland Mosquito TT.39, Miles Monitor, Short Sturgeon TT.1,
PR.31/46 English Electric Canberra PR3
R.5/46 Four engine long-range Maritime patrol bomber - Liberator GR replacement Avro Shackleton
R.42/46 Avro Shackleton
B.5/47 OR.235 Three-seat twin-engine high-altitude fast jet bomber carrying no defensive armament - Mosquito replacement - revised from B.3/45 (q.v.) to include visual bombing requirement English Electric Canberra B.2
C.2/47 Brabazon Committee Type III Airliner - medium-range Empire transport Bristol Britannia, Handley Page H.P.83, Handley Page H.P.84, Handley Page H.P.85, Handley Page H.P.86
E.8/47 OR.250 Experimental one-half scale research version of Bristol Type 172 four-jet long range bomber design - later revised for reconfigured Type 176 - all subsequently cancelled Bristol Type 174
E.10/47 Experimental research jet Fairey Delta 1
N.9/47 Naval carrier-borne jet fighter/research aircraft Supermarine Type 508, Supermarine Type 529
T.1/47 Two seat trainer version of Meteor - written around Gloster's civil Meteor demonstrator G-AKPK Gloster Meteor T.7
T.14/47 Two-seat advanced trainer using Merlin 35 - replacement for T.7/45 (q.v.) Avro Athena T.2, Boulton Paul Balliol T.2
8/48 ab initio trainer - Tiger Moth replacement - written for Chipmunk T.10 production order de Havilland Chipmunk T.10
E.6/48 no OR Experimental research aircraft using one-third scale version of Handley Page B.35/46 wing design Handley Page HP.88
E.15/48 no OR Experimental one-third scale low-speed research version of Avro's B.35/46 design Avro 707
F.3/48 OR.228 Written for P.1067, replaced F.43/46 Hawker P.1067 (Hawker Hunter)
F.4/48 OR.227 Two-seat twin-engined night/all weather fighter - replacement for Vampire NF de Havilland DH.110, Gloster Javelin
F.24/48 Two-seat twin-engined night/all weather fighter - interim stop-gap for F.4/48 - Meteor NF development originally to F.44/46 (q.v.) Armstrong Whitworth Meteor NF.11
B.9/48 OR.231 Four engine jet heavy bomber - less advanced stop-gap for B.35/46 designs - written around Valiant Vickers Valiant
B.22/48 OR.302 Pathfinder version of Canberra English Electric Canberra B.5
E.7/48 Experimental unmanned target aircraft powered by turbojet engine - Queen Martinet replacement Government Aircraft Factory Jindivik
R.2/48 OR.231 Reconnaissance flying boat - Cancelled Blackburn B-78, Saunders-Roe P.162, Short PD.2, Supermarine 524
T.8/48 Basic trainer DHC Chipmunk T10
T.12/48 Trainer - two-seat Wyvern conversion trainer Westland Wyvern T.3
T.13/48 Vickers Varsity
T.16/48 Trainer - Prentice replacement Handley Page H.P.R.2, Percival Provost
A.13/49 Saro Skeeter
C.19/49 Transport - Hastings C.2 order Handley Page Hastings C.2
E.10/49 Experimental - additional order for Avro 707s including side-by-side seating conversion-trainers - these later cancelled - see also E.15/48 Avro 707
E.16/49 Swept-wing Mach 2 research aircraft Armstrong-Whitworth AW.58
E.27/49 Delta wing research Boulton Paul P.120
F.15/49 Jet fighter - interim Vampire replacement de Havilland Venom
F.23/49 OR.268 Supersonic jet fighter/interceptor English Electric Lightning
M.6/49 OR.275 Light carrier-borne ASW - written around Short Sturgeon variant - spec derived from GR.17/45 Short S.B.3
N.14/49 Naval carrier-borne all-weather strike fighter - see also N.40/46 & F.4/48 de Havilland Sea Vixen
T.1/49 Navigation trainer Vickers Valetta T3
T.2/49 Dual-control training version of Canberra English Electric Canberra T4

Post 1949 Operational Requirements and Naval Requirements

OR Year Type Related aircraft
ER.100 194? Experimental low-speed research version of English Electric P.1 (q.v.) Short S.B.5
ER.103 1947 Experimental research aircraft capable of Mach 1.5 at 36,000 ft - modified for P.1 as F.23/49 (q.v.) English Electric P.1, Fairey Delta 2
OR.301 February 1952 Rocket propelled interceptor Saunders Roe SR.53, Avro 720
OR.303 195? Lightweight fighter to intercept Sovietmarker Tu-4 bombers Folland Midge
OR.304 195? Helicopter for Coastal Command Bristol Sycamore
OR.323 195? Transport aircraft - Hastings replacement Armstrong Whitworth Argosy, English Electric P.14
OR.324 1952 Low-level bomber - Spec. B.126T written to this OR - cancelled 1954 Avro 721, Handley Page H.P.99 - proposals also tendered by: Bristol, Short & Vickers.
OR.334 195? VTOL transport aircraft Fairey Rotodyne; later cancelled
OR.351 1960 V/STOL Freighter (NATO NBMR.4) English Electric P.36
ER.43 ~1953 Experimental direct jet-lift VTOL research aircraft Short SC.1
ER.134 1953 Experimental high-speed research aircraft capable of sustaining Mach 2.75 to investigate effect of kinetic heating on airframe Bristol 188, English Electric P.6
ER.163 195? Experimental Fairey Delta 2 with de Havilland Gyron engine - later cancelled Fairey Delta 2
ER.204D 195? Experimental VTOL aircraft using Bristol Pegasus Hawker P.1127
NA.39 1953 Carrier borne strike aircraft to Spec. M.148T Blackburn Buccaneer, Short PD.13
NA.47 195? Mixed rocket-jet interception fighter for RN Saunders-Roe SR.177; cancelled 1957
NR/A.32 195? Light carrier-borne ASW to Spec. M.123 Short Seamew
F138D 1953 Mixed rocket-jet interception fighter - written around SR.53 Saunders-Roe SR.53
F.153D 1953 Fighter (Javelin development)
F.155T 1955 High-altitude fighter English Electric P.8
R.156T 1955 Mach 3 reconnaissance aircraft English Electric P.10
OR.330 1954 Supersonic high flying reconnaissance aircraft Avro 730, Handley Page H.P.100
OR.329 /F.155 1955? Supersonic high flying interceptor Fairey "Delta III"; cancelled 1957
OR.356 19?? Supersonic V/STOL - Spec. SR.250 Hawker Siddeley P.1154; later cancelled
OR.357 19?? Maritime reconnaissance aircraft - led to Nimrod Hawker Siddeley Nimrod
OR.362 19?? Supersonic trainer aircraft - led to Jaguar SEPECAT Jaguar
GOR.2 1959 VTOL Strike Reconnaissance aircraft English Electric P.31, Gloster P.505
GOR.339 1956 STOL Tactical-Strike/Reconnaissance aircraft capable of Mach 2 and suitable for operation from unpaved strips - Canberra replacement British Aircraft Corporation TSR-2; later cancelled
GOR.345 195? V/STOL combat aircraft version of Hawker P.1127 - Harrier development Hawker Siddeley Harrier
GSR.3335 196? Helicopter - Scout replacement Westland Lynx
GSR.3336 196? Helicopter - Sioux replacement Westland Gazelle
RB.156 Reconnaissance-bomber Avro 730
ASR.365 196? Helicopter - Tactical Support Westland Puma
ASR.367 196? Bomber - Vulcan B.2 - see also B.35/46 Avro Vulcan B.2
ASR.368 196? Bomber - Victor B.2 - see also B.35/46 Handley Page Victor B.2
ASR.371 196? Transport aircraft Short Belfast
ASR.372 196? Trainer version of Lightning - Lightning T.5 English Electric Lightning T.5
ASR.373 196? VIP Transport aircraft - Andover CC.2 Hawker Siddeley Andover CC.2
ASR.376 196? Tanker aircraft Handley Page Victor B.1/1A
ASR.378 196? Transport aircraft - VC10 Vickers VC10
ASR.381 196? Interim Maritime Patrol aircraft to Spec. MR.254 - written around Atlantique Breguet Atlantique
ASR.382 196? Two-seat trainer version of P.1154 for RAF - cancelled Hawker Siddeley P.1154
ASR.384 196? Harrier requirement - see also GOR.345 Hawker Siddeley Harrier
ASR.385 196? Phantom for RAF McDonnell Douglas F-4M Phantom
ASR.397 1970 Basic jet trainer - Jet Provost replacement Hawker Siddeley Hawk
ASR.409 Harrier replacement McDonnell Douglas AV-8 as Harrier GR.5
NSR.6451 19?? V/STOL carrier borne fighter aircraft - Naval Harrier BAE Sea Harrier

See also


  1. London 2003, p.283.
  2. the requirement is often incorrectly stated to have required the use of Rolls-Royce Vulture engines. For example, by Thetford, Aircraft of the Royal Air Force since 1918, ("Avro Manchester") and Mason, The British Bomber ("Avro Manchester"). It is denied by Buttler, Projects, pp. 100–102 , and Sinnott, Aircraft Design, pp. 165–171.
  3. Buttler 2004
  4. Jackson (1974)
  5. London 2003, p.285.


  • Aeroplane Monthly Magazine. - various articles - various issues 1973-1987. Web site
  • Buttler, Tony. Secret Projects: British Fighters and Bombers 1935-1950 (British Secret Projects 3). Leicester, UK: Midland Publishing, 2004. ISBN 1857801792.
  • Green, William. Famous Bombers of the Second World War, 2nd Edition. London: MacDonald & Jane's,1975. ISBN 0356083330.
  • Jackson, A.J. 1974. British Civil Aircraft since 1919. London: Putnam. ISBN 037010014X.
  • London, Peter. British Flying Boats. Stroud, UK:Sutton Publishing, 2003. ISBN 0-7509-2695-3.
  • Meekcoms, K.J. and Morgan, E.B. The British Aircraft Specifications File. London: Air Britain, 1994. ISBN 0851302203.
  • Munson , Kenneth. Bombers Between the Wars 1919-39 - Including Patrol and Transport Aircraft (Blandford Colour Series). London: Associate R.Ae.S., 1970. ISBN 0713705140.
  • Munson , Kenneth. Bombers In Service - Patrol and Transport Aircraft Since 1960 (Blandford Colour Series). London: Associate R.Ae.S., 1972. ISBN 0713705868.
  • Munson , Kenneth. Fighters 1939-45 - Attack and Training Aircraft (Blandford Colour Series). London: Associate R.Ae.S., 1975. ISBN 0713703784.
  • Munson , Kenneth. The Pocket Encyclopedia of Bombers At War (Blandford Colour Series, New Orchard Edition). London: Associate R.Ae.S., 1977. ISBN 0185079028. :This is a combined volume made up of the following separate books:
    • Munson, Kenneth.Bombers Patrol and Reconnaissance Aircraft 1914-1919 (Blandford Colour Series) . London: Associate R.Ae.S., 1977. ISBN 0713706328.
    • Munson, Kenneth. Bombers Patrol and Transport Aircraft 1939-1945 (Blandford Colour Series) , London: Associate R.Ae.S., 1975. ISBN 0713703792.
  • Sinnott, Colin. The RAF and Aircraft Design, 1923-1939: Air Staff Operational Requirements London: Frank Cass, 2001. ISBN 0714651583

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