Turing cracked codes using a Bombe, which is a machine invented by the Polish and is not a computer. His main work in computing came after the war, joining the pre-existing programme at Manchester where he wrote an early program. His achievements are many, and it isn’t necessary to attribute to him ones that were others, or to do him the disservice of misattribution because he happens to be a “celebrity”.

The computing work at Bletchley Park consisted of the Colossus machines, built by Tommy Flowers to crack communications between the German High Command, while Turing was on a separate programme using improved bombes to decrypt Enigma.