ALT Promotional image showcasing the new Bank of England £50 note featuring Alan Turing, with a detailed background and a rainbow graphic, accompanying the hashtag "TuringChallenge.

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT on a rich red background there are five bombe rotors around the edge. In the centre is two columns of rows of close up secitons of the new banknote each row is numbered 1 to 7

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT The new £50 and the Turing Challenge hashtag on a red background

ALT A stylised image of the new £50 note featuring Alan Turing surrounded by ticker tape showing binary code and a rainbow ribbon. The title 'The new £50 note' is on the right and #TuringChallenge is at the bottom. Some of Alan Turing's notes are in the background which is a dark red colour.

ALT A stylised image of the new £50 note featuring Alan Turing surrounded by ticker tape showing binary code and a rainbow ribbon. The title 'The new £50 note' is on the right and #TuringChallenge is at the bottom. Some of Alan Turing's notes are in the background which is a dark red colour.