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• Catalogue level

  Department

  Records of the Cabinet Office

  The Cabinet Office records........comprise the most valuable single collection of modern (British) material for historical purposes that can be obtained from official sources (Report of the Committee on Departmental Records 1954 (Grigg Report), 147 (…

  Held by

  The National Archives, Kew

  Date

  1863-2024

  Reference

  CAB

• Catalogue level

  Series

  Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister,...

  This series contains summaries of selected signals intelligence reports, issued by the Government Code and Cypher School and sent by the head of MI6 ("C") to the Prime Minister (or, in his absence, the Deputy Prime Minister or the Lord Privy Seal) in…

  Held by

  The National Archives, Kew

  Date

  1844-1945

  Reference

  HW 1

• Catalogue level

  Series

  Foreign Office: Prisoners of War and Aliens Department: General Correspondence from...

  This series contains records of the Prisoners of War and Aliens Department, and is one of the series of Foreign Office records arising from, and employing, the FO central registry system for correspondence for the period from 1906. The records in FO …

  Held by

  The National Archives, Kew

  Date

  1915-1919

  Reference

  FO 383

• Catalogue level

  Series

  Loraine Papers

  This series contains both personal and official papers, including photograph albums, of the diplomat Sir Percy Loraine (1880-1961). It includes correspondence of 1916 to 1949 with Loraine's friend and fellow diplomat Sir Lancelot Oliphant (1881-1965)…

  Held by

  The National Archives, Kew

  Date

  1836-1973

  Reference

  FO 1011

• Catalogue level

  Series

  War Office: Geographical Section General Staff: War of 1914-1918: Gallipoli Campaign,...

  Topographical, reconnaissance and operations (trench) maps and diagrams; Admiralty charts and naval operations diagrams (at 1:24 000 and 1:26 000); air photographs; sketches and panoramas of Turkey in Europe, Turkey in Asia, and the Dardanelles Strai…

  Held by

  The National Archives, Kew

  Date

  1905-1929

  Reference

  WO 301

• Catalogue level

  Series

  Government Code and Cypher School: Records Concerning Polish Business and Activities

  This series contains records produced by various Government Code and Cypher School sections, but later brought together as a single collection. They concern: co-operation between the School and free-Polish personnel on the interception of Soviet comm…

  Held by

  The National Archives, Kew

  Date

  1940-1946

  Reference

  HW 47

• Catalogue level

  Series

  Foreign Office and Successors: Control Commission for Germany (British Element),...

  This series contains Field Information Agency Technical reports of interrogation of Albert Speer and other civilian personalities, intelligence reports, Ministerial Collecting Centre reports and German Ministry for Production documents and papers. Th…

  Held by

  The National Archives, Kew

  Date

  1913-1946

  Reference

  FO 1078

• Catalogue level

  Series

  Government Code and Cypher School and Government Communications Headquarters: Records...

  This series contains records produced during the production of the History of British Signals Intelligence in World War II (now preserved in HW 11). These working papers cover all aspects of the work carried out at Bletchley Park, as well as intercep…

  Held by

  The National Archives, Kew

  Date

  1914-1954

  Reference

  HW 50

• Catalogue level

  Series

  Government Code and Cypher School: Security of Allied Cyphers Section: Security Files...

  This series contains files produced by the Security of Allied Cyphers Section, dealing with various aspects of work to prevent and counter enemy penetration of allied cyphers during the Second World War. A number of the files, though opened during th…

  Held by

  The National Archives, Kew

  Date

  1917-1979

  Reference

  HW 40

• Catalogue level

  Series

  Government Code and Cypher School: Administration Files on the Radio Security Service

  This series contains records of Government Code and Cypher School tasking of Radio Security Service for interception of German and other enemy illicit wireless communications, analysis of the communications, and records of relations with wartime alli…

  Held by

  The National Archives, Kew

  Date

  1938-1946

  Reference

  HW 34

• Catalogue level

  Series

  Government Code and Cypher School: Diplomatic Section: Reports of German Diplomatic...

  Reports of German diplomatic messages decyphered by the Diplomatic Section. GERDI (German Diplomatic) reports contain general diplomatic intelligence and agent material. IR (Ireland) reports contain messages between the German Ministry of Foreign Aff…

  Held by

  The National Archives, Kew

  Date

  1942-1943

  Reference

  HW 36

• Catalogue level

  Series

  Government Code and Cypher School: Diplomatic Section: Diplomatic Decrypts Passed...

  The records in this series consist of a number of decrypts of diplomatic wireless traffic passed to the Director General of the Secret Intelligence Service for distribution. The records appear to be the RES (Reserved) series of BJ decrypts or, alter…

  Held by

  The National Archives, Kew

  Date

  1935-1945

  Reference

  HW 37

• Catalogue level

  Series

  Government Code and Cypher School, Foreign Office and General Post Office: Maintenance...

  This series contains records of the Foreign Office, the General Post Office and the Government Code and Cypher School relating to work during the Second World War to establish and maintain Foreign Office intercept (Y) stations.

  Held by

  The National Archives, Kew

  Date

  1941-1945

  Reference

  HW 55

• Catalogue level

  Department

  Records created or inherited by Government Communications Headquarters (GCHQ)

  Records created and inherited by the Government Code and Cypher School (GCCS) and its successor the Government Communications Headquarters (GCHQ) relating to interception of enemy communications and ensuring security of government electronic communic…

  Held by

  The National Archives, Kew

  Date

  1914-2024

  Reference

  HW

• Catalogue level

  Series

  Government Code and Cypher School and Government Communications Headquarters: London...

  This series consists of telegrams originating in Government Code and Cypher School (GC&CS) during the Second World War and quoted by Churchill in his history of the War, which were edited prior to publication by Monty Davenport of the Communicati…

  Held by

  The National Archives, Kew

  Date

  1944-1954

  Reference

  HW 71

• Catalogue level

  Series

  Special Operations Executive: Registry: Miscellaneous Nominal Card Index

  This series consists of a nominal index relating to subjects who did not fit into any of the main SOE indexes. It lists: SOE personnel or contacts in various countries (mainly in the Balkans, Italy, Germany, the Netherlands, Austria and Switzerland, …

  Held by

  Date

  1940-1946

  Reference

  HS 20

• Catalogue level

  Series

  Government Code and Cypher School: Liaison with Signals Intelligence Organisations...

  This series contains records on GC&CS liaison with signals intelligence organisations in the United States from 1943 to 1945, with correspondence between the organisations, reports and details of exchanges of crypt and technical information. The …

  Held by

  The National Archives, Kew

  Date

  1941-1946

  Reference

  HW 57

• Catalogue level

  Series

  Government Code and Cypher School: Air Section: Correspondence, Analytical and Technical...

  This series contains unregistered messages, correspondence and reports of the Air Section with the Air Ministry, with RAF Cheadle and other authorities, principally on technical analysis and interception matters relating to German Air Force communica…

  Held by

  The National Archives, Kew

  Date

  1940-1942

  Reference

  HW 66

• Catalogue level

  Series

  Cabinet Office: Special Secret Information Centre: Files

  This series consists of files prepared as definitive dossiers on major defence and political issues. The file series were set up by General Ismay, Deputy Secretary on the military side of the War Cabinet and Secretary to the Chiefs of Staff Committee…

  Held by

  The National Archives, Kew

  Date

  1939-1955

  Reference

  CAB 121

• Catalogue level

  Series

  Cabinet Office: Central Intelligence Machinery: Joint Intelligence Committee (A):...

  This series comprises the Secretariat minutes of the Joint Intelligence Committee (A) during the period January 1969 to September 1974, following the redesignation of JIC as JIC (A), and thereafter the Secretariat minutes of the Joint Intelligence Co…

  Held by

  Date

  1969-

  Reference

  CAB 187