Article 5(1)
You shall well and truly, after your knowledge and discretion, make the assays of these moneys of gold, silver, gold-plated silver, cupro-nickel, nickel-brass and bimetal, and truly report if the said moneys be in weight and fineness or composition according to the standard weights for weighing and testing the coins of the realm, and the standard trial plates of gold, silver, copper, nickel and zinc in the custody of the Secretary of State and used for determining the justness of the gold, silver, gold-plated silver, cupro-nickel, nickel-brass, and bimetallic coinage of the realm, and be in conformity with the Coinage Act 1971 or any proclamation in force in pursuance of that Act; and if the diameter of such of these coins as are of cupro-nickel, nickel-brass and bimetal be in conformity with that Act or any such proclamation as aforesaid; so help you God.