Royal Mint resume minting their own supplementary tokens. In 1672 the Royal Mint finally took over the production of copper coinage. Prior to the outbreak of the English Civil War, England signed a treaty in 1630 with Spain which ensured a steady supply of silver bullion to the Tower mint. Additional branch mints to aid the one in London were set up including one at Aberystwyth Castle, in Wales. In 1642 parliament seized control of the Tower mint and after Charles I tried to arrest the Five Members he was forced to flee London, establishing at least 16 emergency mints across the
Royal Mint Court in between 1807-1812 by Robert Smirke after Johnson died, having never seen his design realised. In honour of both architects, the building was named the Johnson Smirke Building, a namesake of both their surnames. Aiming to increase mint production, the building was designed for multiple purposes including to house new mint machinery, act as a bullion store, the mint's office and apartments for mint officials. The long façade of the three-storey rectangular stone building has windows with Doric order running through the first and second floors. A broad central pediment sits above featuring the royal coat of arms engraved in