Bimetallic coin to mark the National Gallery’s bicentenary

A new coin has been issued to mark the National Gallery’s 200th anniversary, although it is unlikely to be seen in shops as it is a collectable coin.
Although it’s a collectable coin, it’s also legal tender, in the very narrow definition of what qualifies as legal tender (no, Scottish banknotes aren’t legal tender). That required the King to authorise the production of the coins with a Royal Proclamation, and they would have been validated in the Trial of the Pyx earlier