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A revealing end of term school report criticising the codebreaker Alan Turing's "vague ideas" has gone on display in Cambridge.
Its one of a number of letters and documents that reveal how Alan Turing grew from a shy schoolboy into a codebreaker who changed the course of history.
Of course most of us know that the codes generated by Enigma were cracked by Alan Turing and a team of mathematician linguists and puzzle experts working at Bletchley Park in Milton Keynes.
Now the exhibition at the Fitzwilliam Museum in Cambridge called Codebreakers and Groundbreakers, includes an original Enigma and its British counterpart the TypeX and objects which have never before been seen by the public.