page_title: Bletchley Park
hierarchical_section_title: Bletchley Park
caption_attribution_description: English: Bletchley Park Mansion. This house was the headquarters for British codebreakers during World War II. The mansion is a Grade II Listed Building in England.This is a photo of listed building number 1125409.
context_page_description: Bletchley Park is an estate in Milton Keynes, Buckinghamshire, England. It was the site of the United Kingdom's main codebreaking team during World War II. Now, Bletchley Park is home to the National Codes Centre and The National Museum of Computing.
  The Government Code and Cypher School and Station X, a secret radio interception station, were also at Bletchley Park. The information gained by workers at Bletchley Park was very important for the Allied war effort.
  In 1939, in Warsaw, the Polish military showed French and British intelligence agents their cryptanalysis of the Enigma. They promised each delegation a Polish-built Enigma. Having an actual Enigma machine, and knowing how to use it, was a much needed start for the British work at Bletchley Park. Dilly Knox and Alan Turing were later joined by many other codebreakers and engineering staff.
  The high-level intelligence produced at Bletchley Park, codenamed Ultra, gave crucial help to the Allied war effort. It was vital during the Battle of the Atlantic, when the German U-boat submarine fleet sank merchant shipping in an attempt to starve Britain of supplies. Winston Churchill was later to say:
context_section_description: Bletchley Park is an estate in Milton Keynes, Buckinghamshire, England. It was the site of the United Kingdom's main codebreaking team during World War II. Now, Bletchley Park is home to the National Codes Centre and The National Museum of Computing.
  The Government Code and Cypher School (GC&CS) and Station X, a secret radio interception station, were also at Bletchley Park. The information gained by workers at Bletchley Park was very important for the Allied war effort.
  In 1939, in Warsaw, the Polish military showed French and British intelligence agents their cryptanalysis of the Enigma. They promised each delegation a Polish-built Enigma. Having an actual Enigma machine, and knowing how to use it, was a much needed start for the British work at Bletchley Park. Dilly Knox and Alan Turing were later joined by many other codebreakers and engineering staff.
  The high-level intelligence produced at Bletchley Park, codenamed Ultra, gave crucial help to the Allied war effort. It was vital during the Battle of the Atlantic, when the German U-boat submarine fleet sank merchant shipping in an attempt to starve Britain of supplies. Winston Churchill was later to say: 
  The Battle of the Atlantic was the dominating factor all through the war. Never for one moment could we forget that everything happening elsewhere, on land, at sea or in the air depended ultimately on its outcome.
  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. The outcome of the war would have been uncertain without it.
caption: The Mansion in 2017
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