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Codebreaker Alan Turing's school report is revealed

The codebreaker Alan Turing and his school report which said he had to buck his ideas up. Credit: Sherborne School Archives/The Provost and Fellows of Kings College Cambridge

A revealing end of term school report criticising the codebreaker Alan Turing's "vague ideas" has gone on display.

It's one of a number of letters and documents that show how Alan Turing grew from a shy schoolboy at Sherborne School in Dorset into a codebreaker who changed the course of history.

A working World War II Enigma machine at the Codebreakers and Groundbreakers' exhibition Credit: PA

Many of us will be aware that Alan Turing grew up to work on Enigma machines. Most of the codes generated by Enigma were cracked by Turing and a team of mathematician linguists and puzzle experts working at Bletchley Park in Milton Keynes.

Being able to decrypt the German codes helped turn the tide of the Second World War in the allies' favour.

At 17, though, the future "father of modern computing" was a pupil at Sherborne School in Dorset, where teachers said his science work was promising - but untidy.

There was little sign then of Mr Turing's genius - the teenager was told he needed to buck up his ideas if he wanted to get into Cambridge University.

You can read a transcript of what his teachers had to say below:.

Read a transcription of Alan Turing's report from Summer 1929. Credit: Sherborne School Archives/The Provost and Fellows of Kings College Cambridge

The 1929 school report is on display at the Codebreakers and Groundbreakers exhibition at the Fitzwilliam Museum in Cambridge.

It includes an original Enigma machine and its British counterpart the TypeX and objects which have never before been seen by the public. Among them is a letter from Turing which indicates that it didn't take long for the young mathematician - who did get into Cambridge and went on to Princeton to get on the right track.

One of my favourites is a letter that he wrote to his mother from Princeton and in that letter he is musing about creating a general type of code. He's actually thinking about this. This is before the war, he's thinking about this already and he's thinking should he sell that idea to the Government.

– JAMES GRIME, ENIGMA PROJECT