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Storm Clouds Gather

Codebreaking at Bletchley Park first took place in September 1938

On 18 September 1938, a small group of people moved into the Mansion under the cover story that they were a shooting party. They had an air of friends enjoying a relaxed weekend together at a country house. They even brought with them one of the best chefs from the Savoy Hotel to cook their food. Behind the cover were members of MI6 and the Government Code and Cypher School (GC & CS), a secret team including a number of scholars and academics turned Codebreakers. As tensions in Europe peaked, Admiral Sinclair, Director of GC & CS and SIS, had activated their War Station: Bletchley Park. The group’s job was to set up and run intelligence activity from Bletchley Park. They responded quickly, transmitting their first message at 6 pm on the day they arrived. As tensions eased, the War Station was stood down. The group returned to their London offices on 9 October.

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Cottage Industry

Codebreaking by GC & CS at Bletchley Park began in earnest in September 1939.

Cottage Industry

Codebreaking by GC & CS at Bletchley Park began in earnest in September 1939.