A giant artwork of Alan Turing has been installed at the heart of GCHQ as the wartime hero becomes the first LGBT person to feature on a UK banknote. The first £50 notes depicting the famed mathematician, who is often considered to be the father of computer science, will be issued from Wednesday, June 23. To mark the occasion, a 10m by 10m rainbow-colored canvas inspired by the LGBT Pride flag has been unveiled at the centre of the GCHQ hub in Benhall, Gloucestershire – a building known as the Doughnut. Mr Turing broke the Enigma code at GCHQ’s wartime headquarters (GCHQ)