The Bletchley Park Trust says it needs about a million pounds (AU$2.06 million) to repair the roof of the park's mansion and a similar amount to restore three huts used by legendary figures such as Alan Turing.
At the bottom of this commemorative British envelope are images of three men who helped crack German codes. Alan Turing (right) had built a machine, called Bombe, that could crack the codes of Enigma. Bombe was electromechanical and thus had a limit to how fast it could calculate. Turing recruited Tommy Flowers (left), who proposed making a completely electronic machine to crack the codes. Flowers was assisted by Allen Combs (center).
Turing, an antiwar protestor in the 1930s, eventually moved on to design the Automatic Computing Engine (ACE) in 1945. (For more on Turing, watch this video about early computers, jointly produced by the BBC and Boston's WGBH.) Flowers went back to designing and building Post Office telephone exchange systems.
Credit: Bletchley Park Post Office
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