4 Feb 2015 at 07:31, Darren Pauli

 

Top secret documents devised by Alan Turing, which should have been destroyed under wartime rules, have been found during renovations of Bletchley Park where they were used in roof cavities to stop draughts.

 

The documents have been identified as 'Banbury sheets', papers punched with holes to allow manual comparison of enciphered texts. Turing devised the sheets as part of his efforts to crack Nazi naval communications were found jammed into holes in the ceiling of Hut 6.

 

Conditions in the room were known to be poor leading code breakers there to stuff wastepaper into holes to keep out the cold.

 

The documents should have been destroyed under wartime rules to maintain secrecy.

 

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