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Advisers decided it would not be “prudent” to strike a coin celebrating Robert the Bruce’s famous victory over the army of England’s Edward II in the same year as the referendum.

Members of a Royal Mint advisory committee also scrapped plans for a 2014 coin to mark the 300th anniversary of the death of Queen Anne, during whose reign England and Scotland were unified as Great Britain.

Minutes from a 2012 meeting at Buckingham Palace say: “A crown piece to commemorate the death of Queen Anne had been proposed but, with the Act of Union being one of the main achievements of her reign and a referendum on devolution being planned for 2014, political concerns were raised.”

The minutes, obtained under freedom of information legislation, show officials also hesitated about a coin to mark the 50th anniversary of England’s 1966 World Cup win after ruling out marking King Robert the Bruce’s 1314 victory in Stirlingshire.