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Diary of Bletchley chief tells of moment special relationship was born Mark Nicol Diplomacy Editor For The Daily Mail © Provided by Daily Mail MailOnline logo A spy chief’s diary has revealed the secret help the US gave Britain’s codebreakers early in the Second World War. With the simple entry ‘The Ys [Yanks] are coming’, Commander Alastair Denniston, first head of the Government Code and Cypher School, which would become GCHQ, recorded the first visit of American cryptographers to Bletchley Park. At the time, February 10, 1941, Denniston was working there with Alan Turing to crack the German Enigma code. The visit by leading US codebreakers to Bletchley was cloaked in secrecy – the US would not enter the war until December that year. It also sealed what Winston Churchill would call the ‘special relationship’ between the two powers.

United statesUnited kingdomMilton keynesWinston churchillCharles danceMatthew beardJoan clarkeKeira knightleyAlan turingMatthew goodePaul nakasoneBenedict cumberbatchAlastair dennistonJeremy flemingAllen leechBarbara abernethy