HM Treasury

UK economy

Trial of the Pyx

The history of the Trial of the Pyx goes back to the twelfth century, making it one of the longest established judicial procedures in the country. The purpose of the annual trial is to check that UK coins produced by the Royal Mint are within the statutory limits for metallic composition, weight and size. The name Pyx refers to the chests in which the coins are transported, and derives from the Pyx chamber in Westminster Abbey where historically the chests were kept, along with other important items of state and church.

The Coinage Act 1971 requires that there be a trial at least once a year to ascertain that UK coins issued by the Royal Mint have been minted in accordance with the Act.

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