Bank of England, Sarah John, polymer £20, ND (20 February 2020), serial number AA01 001818, purple and multicoloured, Queen Elizabeth II at right and in a transparent window at left with text £20 BANK OF ENGLAND. Margate lighthouse in gold and the Turner Contemporary in blue appear over the window, a second smaller window based on Tintern Abbey low right. Reverse purple, a self portrait of Turner and his painting of The Fighting Temeraire in field, a purple foil patch at upper right with letter T is based on the staircase at the Tate Britain (EPM B416), this serial the date of Turners renowned lecture in which the phrase "light is therefore colour" was coined
