UK. 15th Oct. 2013, the Royal Mint releases United Kingdom's first ever £20 coin to those who had it on special order. The coin will go on general release on 31st October 2013. The George and the Dragon 2013 £20 Fine Silver Coin. It is minted in fine silver and carries one of the most famous designs ever to feature on Britain's coins, the design was made famous on the gold Sovereign. The coin is legal tender.