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• Catalogue level

  Series

  Government Code and Cypher School: Cryptographic Co-ordination and Records: Bulgarian...

  This series contains decrypts of messages received and sent by the Bulgarian military attaché.

  Held by

  The National Archives, Kew

  Date

  1945

  Reference

  HW 24

• Catalogue level

  Series

  Government Code and Cypher School: Diplomatic Section: Reports to British Agencies...

  This series consists of reports of Japanese diplomatic intercepts concerning subversion of potential interest to British security agencies.The reports contain information significant in the conduct of the Second World War.

  Held by

  The National Archives, Kew

  Date

  1943

  Reference

  HW 38

• Catalogue level

  Series

  Government Code and Cypher School: Naval Section: Reports of German, Italian, French,...

  This series consists of records of the Naval Section comprising reports on German, Italian and French naval activity and on German, Italian, French and Spanish naval communications during the Second World War period, based on signals intelligence. Th…

  Held by

  Date

  1938-1945

  Reference

  HW 18

• Catalogue level

  Series

  Government Code and Cypher School: Diplomatic and Commercial Sections: Reports of...

  This series comprises messages passing between governments and their legal representatives abroad. The COM file series had the same Top Secret classification as the BJ file in which diplomatic traffic was issued, and was subject to the same condition…

  Held by

  Date

  1942-1945

  Reference

  HW 32

• Catalogue level

  Series

  Government Code and Cypher School: Military Section: Reports of Croatian Military...

  This series contains reports of Croatian military and naval activity derived from decrypts of signals. The series also includes the Croatian army order of battle.

  Held by

  The National Archives, Kew

  Date

  1944-1945

  Reference

  HW 26

• Catalogue level

  Series

  Government Code and Cypher School: Air Section: Reports on Italian and Other Foreign...

  Intelligence reports on foreign (European) air forces produced by the Air Section. To aid the understanding of these reports, a number of working aids and orders of Battle are also included, also some correspondence files relating to the reports.The …

  Held by

  The National Archives, Kew

  Date

  1936-1944

  Reference

  HW 21

• Catalogue level

  Series

  Government Code and Cypher School: Military Section: Reports of Japanese Army Decrypts

  This series contains reports of Japanese Army decrypts including Japanese order of battle information and army activity.

  Held by

  The National Archives, Kew

  Date

  1941-1945

  Reference

  HW 33

• Catalogue level

  Series

  Government Code and Cypher School: Tactical Sigint forwarded to Allied Commands:...

  This series consists of intelligence reports prepared in Hut 3 at Bletchley Park, for transmission to allied commands abroad. These reports were paraphrases of the reports as sent to home establishments, to conceal that they were derived from decrypt…

  Held by

  The National Archives, Kew

  Date

  1940-1945

  Reference

  HW 20

• Catalogue level

  Series

  Government Code and Cypher School: Special Liaison Units: Histories

  This series contains histories written at the end of World War II by staff of the Special Liaison Units who oversaw the distribution of ULTRA intelligence material to service units and headquarters during the war.

  Held by

  The National Archives, Kew

  Date

  1940-1945

  Reference

  HW 49

• Catalogue level

  Series

  Government Code and Cypher School: Establishment Branch: Records

  This series contains Establishment Branch correspondence on accommodation, personnel, staffing, pay and conditions, communications and physical security matters at Bletchley Park, Buckinghamshire.

  Held by

  The National Archives, Kew

  Date

  1938-1946

  Reference

  HW 64

• Catalogue level

  Series

  Government Code and Cypher School: Diplomatic Section and Commercial Section: Records

  This series contains records of the Commercial and Diplomatic sections dealing with the acquisition, processing and distribution of diplomatic and commercial messages.

  Held by

  The National Archives, Kew

  Date

  1923-1945

  Reference

  HW 53

• Catalogue level

  Series

  Government Code and Cypher School: Anglo-French Liaison Records

  This series contains records produced by various GC&CS sections concerning liaison with the French on analysis of intercepted enemy communications and the breaking of enemy and other cyphers during the Second World War.

  Held by

  The National Archives, Kew

  Date

  1938-1945

  Reference

  HW 65

• Catalogue level

  Series

  Government Code and Cypher School: Staffing, Recruitment and Conditions of Service...

  This series consists of miscellaneous papers on the administration, staffing, recruitment and conditions of service of staff of the Government Code and Cypher School (GC&CS), from the inter-war years through to the end of the Second World War. Th…

  Held by

  The National Archives, Kew

  Date

  1927-1945

  Reference

  HW 72

• Catalogue level

  Series

  Government Code and Cypher School: Japanese Section: Diplomatic Intelligence Summary...

  Summaries of intelligence concerning diplomatic communications between Japan and her overseas representatives, obtained from various sources. The summaries cover all aspects of the war, but especially Japanese peace overtures. Key to Abbreviations: J…

  Held by

  The National Archives, Kew

  Date

  1945

  Reference

  HW 10

• Catalogue level

  Series

  Government Code and Cypher School and predecessors: Personal Papers, Unofficial Histories,...

  This series contains correspondence, working papers and initial drafts of both official and unofficial histories of British signals intelligence (sigint).The records focus on prominent individuals and events, such as the deciphering of the Zimmerman …

  Held by

  The National Archives, Kew

  Date

  1914-1945

  Reference

  HW 3

• Catalogue level

  Series

  Government Code and Cypher School: Services Field Signals Intelligence Units: Reports...

  This series consists of the reports to the Government Code and Cypher School by field signals intelligence units of the armed services based on decrypted intercepted enemy communications during and immediately preceding World War II. The series also …

  Held by

  The National Archives, Kew

  Date

  1914-1977

  Reference

  HW 41

• Catalogue level

  Series

  Government Code and Cypher School: Naval Section: Reports of Japanese Naval Decrypts

  This class contains decrypts of high medium and low grade Japanese naval cypher messages produced by the Naval Section of GC and CS Bletchley. These messages cover a wide range of subjects from supplies to engagements with allied ships and aircraft. …

  Held by

  The National Archives, Kew

  Date

  1940-1945

  Reference

  HW 23

• Catalogue level

  Series

  Government Code and Cypher School: German Police Section: Decrypts of German Police...

  Information relating to concentration camps such as Auschwitz, Buchenwald and Dachau and on the Russian Front. The series also contains details of the results and losses of allied bombing raids and allied aircraft losses, prisoners of war (both captu…

  Held by

  The National Archives, Kew

  Date

  1935-1945

  Reference

  HW 16

• Catalogue level

  Series

  Government Code and Cypher School: Second World War Intelligence Summaries Based...

  This material is the result of intelligence assessments by the different Intelligence organisations (eg Bletchley Park, and Military, Naval and Air Force Intelligence Services), of German signals, messages and reports intercepted and processed by the…

  Held by

  The National Archives, Kew

  Date

  1918-1945

  Reference

  HW 13

• Catalogue level

  Series

  War Office: Military Intelligence Papers (Special Series) First World War

  This series consists of documents relating to intelligence activity in Europe, Russia and the Middle East, which were extracted from files in WO 106, WO 157 and WO 158

  Held by

  The National Archives, Kew

  Date

  1916-1923

  Reference

  WO 160