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  Series

  Government Code and Cypher School: German Signals Intelligence in the Second World...

  This series contains GC&CS studies undertaken into the German Central Cryptographic Organisation (OKW/CHI) operations against British cyphers before and during the Second World War.

  Held by

  The National Archives, Kew

  Date

  1934-1945

  Reference

  HW 73

• Catalogue level

  Series

  Government Code and Cypher School: Research Section: Memoranda, Minutes and Weekly...

  Reports made on a weekly basis by the Research Section and memoranda including notes on German diplomatic code and traffic received.Minutes of meetings of the Directing Sub-Committee of the Research Section.

  Held by

  The National Archives, Kew

  Date

  1941-1944

  Reference

  HW 78

• Catalogue level

  Series

  Government Communications Headquarters and Predecessor: Records relating to the development...

  This series covers the signing of the 1946 BRUSA Communications Intelligence Agreement between the UK and US Sigint organisations, and the development of the Agreement up to 1956 by which time it had become known as the UK-US Communications Intellige…

  Held by

  The National Archives, Kew

  Date

  1945-1956

  Reference

  HW 80

• Catalogue level

  Series

  Government Code and Cypher School: Directorate: Second World War Policy Papers

  This series provides day to day detail of the workings of the Government Code and Cypher School (GCCS) following its move from Broadway Buildings in London to Bletchley Park (BP) at the start of the Second World War.The directorate papers reflect the…

  Held by

  The National Archives, Kew

  Date

  1933-1949

  Reference

  HW 14

• Catalogue level

  Series

  Government Code and Cypher School: Weekly Reports

  Reports made on a weekly basis of the activities of the following Huts at the Government Code and Cypher School at Bletchley Park: Hut 3 - This hut housed the main reporting section, they translated and compiled the intelligence reports. Hut 6 - This…

  Held by

  The National Archives, Kew

  Date

  1941-1945

  Reference

  HW 77

• Catalogue level

  Series

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

  This series contains reports of decrypts of signals of attachees at various posts world-wide.

  Held by

  The National Archives, Kew

  Date

  1942-1945

  Reference

  HW 35

• Catalogue level

  Series

  Government Code and Cypher School: Cypher Messages of Allies

  This series contains intercepted cypher messages of the Free French, Belgian, Dutch and Polish forces, mostly related to intelligence matters. There are also a small number of Brazilian messages.

  Held by

  The National Archives, Kew

  Date

  1942-1945

  Reference

  HW 74

• Catalogue level

  Series

  Government Code and Cypher School: Signals relating to the Establishment of Communications...

  This series contains records relating to the establishment and development of communication links between the Government Code and Cypher School at Bletchley Park and the various overseas stations set up to intercept enemy telecommunications. The seri…

  Held by

  The National Archives, Kew

  Date

  1941-1945

  Reference

  HW 59

• Catalogue level

  Series

  Government Communications Headquarters and predecessor: Soviet Bloc reports

  This series covers GCHQ reports on the Soviet Bloc countries issued during the period 1945-1950 inclusive. The countries included in this series are Albania, Bulgaria, Czechoslovakia, Hungary, Poland, Romania, Soviet Union (USSR), and Yugoslavia. The…

  Held by

  The National Archives, Kew

  Date

  1945-1950

  Reference

  HW 75

• Catalogue level

  Series

  Government Code and Cypher School: Air Section: Weekly Reports

  Weekly reports on progress in cryptography, intelligence and traffic analysis, as well as personnel matters.

  Held by

  The National Archives, Kew

  Date

  1942-1945

  Reference

  HW 56

• Catalogue level

  Series

  Government Code and Cypher School: Naval Section and Air Section: Reports based on...

  This series contains reports from the Naval and Air Sections based on Japanese naval air force decrypts. The reports contain information on Japanese naval air force operational and administrative matters.

  Held by

  The National Archives, Kew

  Date

  1943-1945

  Reference

  HW 27

• Catalogue level

  Series

  Government Code and Cypher School: Collection and Analysis of Middle Eastern and...

  This series contains records held by the Government Code and Cypher School (some of which originated in the War Office and in various service units) relating to the organisation of interception and analysis of enemy communications in the Middle East …

  Held by

  The National Archives, Kew

  Date

  1943-1944

  Reference

  HW 68

• Catalogue level

  Series

  Government Code and Cypher School: Summary Reports, Second World War in the Far East

  This series contains summaries describing the war against Japan in the Far East, and its immediate aftermath, based on decrypts of intercepted messages from mainly Japanese diplomatic, military and naval sources. The summaries show the influence of i…

  Held by

  The National Archives, Kew

  Date

  1944-1945

  Reference

  HW 44

• Catalogue level

  Series

  Government Code and Cypher School: Air Section: Reports based on Japanese Army Air...

  This series consists of reports by the Air Sections based on Japanese army air force decrypts. They contain information on Japanese army air force operational and administrative matters.

  Held by

  The National Archives, Kew

  Date

  1943-1946

  Reference

  HW 28

• Catalogue level

  Series

  Government Code and Cypher School: Japanese Military Intelligence Section: Reports...

  This series contains reports, including summary reports and orders of battle, issued by the Japanese Military Intelligence Section concerned with the activities and organisation of Japanese land forces during 1944 and 1945 derived from intercepted co…

  Held by

  The National Archives, Kew

  Date

  1943-1945

  Reference

  HW 46

• Catalogue level

  Series

  Room 40 and successors: World War I Official Histories

  Official histories of the First World War from the viewpoint of the various signals intelligence organisations written by Senior Government Code and Cypher School members of staff. The series also includes some semi-official historical papers relatin…

  Held by

  The National Archives, Kew

  Date

  [c1910]-1923

  Reference

  HW 7

• Catalogue level

  Series

  Admiralty: Plymouth Station: Correspondence

  Correspondence consisting of, in the main, letters from the Admiralty, including files of the First World War concerning the operation of the Auxiliary Patrol in the Plymouth Command area, mines and minesweeping, submarines and attacks on convoys and…

  Held by

  The National Archives, Kew

  Date

  1842-1969

  Reference

  ADM 131

• Catalogue level

  Series

  War Office: Registered Papers (Special Series)

  This series consists of documents removed from the general series of War Office registered files (WO 32) because they were of continuing sensitivity at the time of the transfer of the majority of the files to the Public Record Office. They cover such…

  Held by

  The National Archives, Kew

  Date

  1912-1946

  Reference

  WO 141

• Catalogue level

  Series

  Cabinet Office: Establishment Section: Administrative Records (E Series)

  This series contains selected files dealing with the administration of the Cabinet Office. Subjects range from the Cabinet Office Sports and Social Association to the appointment of a Washington representative of the Joint Intelligence Committee. The…

  Held by

  The National Archives, Kew

  Date

  1917-1980

  Reference

  CAB 150

• Catalogue level

  Series

  Foreign Office and Predecessors: Allied Commission for Austria (British Element):...

  This series consists of papers circulated by Allied bipartite (i.e. Anglo-American) and British organisations and subsequently deposited in the library of the Allied Council for Austria, British Element. They include minutes and agendas, intelligence…

  Held by

  The National Archives, Kew

  Date

  1944-1955

  Reference

  FO 1007