Bletchley Park and the Ultra Secret

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• During the Second World War, Bletchley Park was the site of the UK’s main decryption establishment, the Government Code and Cypher School (GC&CS), where ciphers and codes of several Axis countries were decrypted, most importantly the ciphers generated by the German Enigma and Lorenz machines. The high-level intelligence produced at Bletchley Park, code named Ultra, provided crucial assistance to the Allied war effort. Sir Harry Hinsley, a Bletchley veteran and the official historian of British Intelligence during the Second World War, said that Ultra shortened the war by two to four years and that the outcome of the war would have been uncertain without it. In this newly commissioned documentary film, the BHTV team of historians and battlefield guides explain the history of this legendary World War Two site. Filmed in collaboration with the Bletchley Park trust, the team have Choose your platform/edition, then jump in—story, missions, and extras depend on the version. Rated 3.9 out of 5.