Alan Turing, the mathematician who helped invent modern computing and break the Enigma code, will be the face of the new £50 note, the Bank of England announced today. Turing, who is considered the father of computer science and artificial intelligence (AI), worked as a codebreaker at Bletchley Park during the Second World War, playing a huge role in switching the advantage to the Allies in the battle for the Atlantic. He was a pioneer of modern computing and proposed an experiment known as the ‘Turing Test’ to discover if a machine could seem human. However in March 1953, Turing was convicted of gross indecency for his relationship with a man and was banned from consulting with GCHQ because homosexuals were ineligible for security clearance.