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The Royal Mint of the United Kingdom is the body permitted to manufacture, or mint, coins in the United Kingdommarker. The Mint originated over 1,100 years ago, but has functioned since 1975 as a Trading Fund, operating in much the same way as a government-owned company. It now has executive agency status, and is currently undergoing the process of being converted into a Government-owned business. The Royal Mint as a body reports to HM Treasurymarker, though departmental day-to-day responsibilities are handled by the Shareholder Executive.

As well as minting coins for the UK, it also mints and exports coins to many other countries, and produces military medals, commemorative medals and other such items for governments, schools and businesses, being known as the world's leading exporting Mint. Responsibility for the security of the site falls to the Ministry of Defence Police, who provide an armed contingent.

The Royal Mint began to move its operations from Tower Hillmarker, Londonmarker to Llantrisantmarker, South Walesmarker, in 1968 and has operated on a single site in Llantrisant, since 1980,where it holds an extensive collection of coins dating from the 16th century onwards. The collection is housed in eighty cabinets made by Elizabeth II's cabinet maker, Hugh Swann.

The annual Trial of the Pyx assays coins produced for the UK government for size, weight and chemical composition.


The London Mint first became a single institution in 886, during the reign of Alfred the Great, but was only one of many mints throughout the kingdom. By 1279 it had moved to the Tower of Londonmarker, and remained there the next 500 years, achieving a monopoly on the production of coin of the realm in the 16th century. Sir Isaac Newton took up the post of Warden of the Mint, responsible for investigating cases of counterfeiting, in 1696, and subsequently held the office of Master of the Royal Mint from 1699 until his death in 1727. He unofficially moved the Pound Sterling to the gold standard from silver in 1717.

The Royal Mint moved from the Tower of London to new premises c.1809
the time Newton arrived the Mint had expanded to fill several rickety wooden buildings ranged around the outside of the Tower. In the seventeenth century the processes for minting coins were mechanised and rolling mills and coining presses were installed. The new machinery and the demand on space in the Tower of London following the outbreak of war with Francemarker led to a decision to move the Mint to an adjacent site in East Smithfieldmarker. The new building, designed by James Johnson and Robert Smirke, was completed in 1809, and included space for the new machinery, and accommodation for the officers and staff of the Mint.

The building was rebuilt in the 1880s to accommodate new machinery which increased the capacity of the Mint. As technology changed with the introduction of electricity and demand grew, the process of rebuilding continued so that by the 1960s little of the original mint remained, apart from Smirke's 1809 building and the gatehouse in the front.

During WWII, the Royal Mint was bombed by the Germans. The Mint was hit on several different occasions and was put out of commission for three weeks at one point .

The Tower Hill site finally reached capacity ahead of decimalisation in 1971, with the need to strike hundreds of millions of new decimal coins, while at the same time not neglecting overseas customers. In 1967 it was announced that the Mint would move away from London to new buildings in Llantrisant, ten miles (16 km) north west of Cardiff. The first phase was opened by Queen Elizabeth II on 17 December 1968, and production gradually shifted to the new site over the next seven years until the last coin, a gold sovereign, was struck in London in November 1975. Smirke's 1809 Building is now used as commercial offices by Barclays Global Investors.

The Royal Mint's Llantrisant site occupies a thirty-eight acre site, employing 765 people.

In 2009 an "incredibly rare" error by the Royal Mint saw up to 200,000 20p coins issued without a year date - one went on to sell for £7,100 on Ebay. The coins are missing their 2009 stamp and are instantly valuable. The mistake happened last year when all coins from 1p to £1 were redesigned. This interruption in the Royal Mint's usually excellent quality control has left coin buffs excited. The last time an undated coin entered circulation was more than 300 years ago in 1672 when Charles II reigned.

Role of the Royal Mint

The Royal Mint exists principally to mint coins for circulation in the UK. However, it also manufactures and circulates coins for over 100 other countries, mints collectors' coins, and produces military medals and civilian decorations for the British armed forces and orders of chivalry. The Royal Mint in London also produced coins for Canadamarker until a branch was opened in Ottawa, Canada in 1908. In the year 1931, control of the Canadian branch mint was passed to the Canadian government and it then became the Royal Canadian Mint.

Trial of the Pyx

The Trial of the Pyx is the procedure in the United Kingdommarker for ensuring that newly-minted coins conform to required standards. The trials have been held since the twelfth century, normally once per calendar year, and continue to the present day. The form of the ceremony has been essentially the same since 1282. They are trials in the full judicial sense, presided over by a judge with an expert jury of assayers. Trials are now held at the Hall of the Worshipful Company of Goldsmiths, having previously taken place at the Palace of Westminstermarker Given modern production methods, it is unlikely that coins would not conform, although this has been a problem in the past as it would have been tempting for the Master of the Mint to steal precious metals.

The term "Pyx" refers to the boxwood chest (in Greek, πυξίς, pyxis) in which coins were placed for presentation to the jury. There is also a Pyx Chapel (or Pyx Chamber) in Westminster Abbeymarker, which was once used for secure storage of the Pyx and related articles.

Coins to be tested are drawn from the regular production of the Royal Mint. The Deputy Master of the Mint must, throughout the year, randomly select several thousand sample coins and place them aside for the Trial. These must be in a certain fixed proportion to the number of coins produced. For example, for every 5,000 bimetallic coins issued, one must be set aside, but for silver Maundy money the proportion is one in 150.

The jury is composed of Freemen of the Company of Goldsmiths, who assay the coins provided to decide whether they have been minted within the criteria determined by the relevant Coinage Acts.


  1. 20p coin sells for £7,100 on Ebay retrieved July 2009
  2. Rare error raises value of 20p

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