Keeley Hawes (Self - Narrator)Jerry Roberts (Self - Senior Cryptographer at Bletchley Park)Jack Copeland (Self - Author of 'Colossus: The Secrets of Bletchley Park's Codebreaking Computers')Paul Gannon (Self - Author of 'Colossus: Bletchley Park's Greatest Secret')Duncan Barrett (Bill Tutte)
This is a documentary about unsung heroes of World War II. In 1943, a 24-year-old maths student and a GPO engineer combined to hack into Hitler's personal super-code machine - not Enigma but an even tougher system, which he called his 'secrets writer'. Their break turned the Battle of Kursk, powered the D-day landings and orchestrated the end of the conflict in Europe. But it was also to be used during the Cold War - which meant both men's achievements were hushed up and never officially recognized.