Bletchley Park was the site of the British codebreaking project during World War 2. It broke the encryption of the famous German Enigma machine and contributed mightily to the winning of the war.
According to The Register:
At the moment the extensive paper and card files held at the site are difficult to use. It’s thought likely that the archives hold clues to many wartime secrets – for instance Allied intelligence on critical Nazi weaknesses such as scarce supplies of rubber. There may also be further revelations about the “greatest double agent” of the war, the fake German intelligence spymaster codenamed GARBO, who was actually working for MI5.
Personnel and equipment for the digitisation project are being provided by Hewlett Packard, the Trust itself being too hard up.
Minor point: The Poles broke the ENIGMA code. Bletchley turned it into an industry.