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• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

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

  Held by

  The National Archives, Kew

  Date

  1941-1945

  Reference

  HW 55

• Moscow with San Francisco, USA. San Francisco; (Comments about individual probably...

  Held by

  The National Archives, Kew

  Date

  1945 Aug 11

  Reference

  HW 15/55/55

• Foreign Office Intercept (Y) Station Knockholt, Kent: Equipment, Works and Buildings

  Held by

  The National Archives, Kew

  Date

  1944 Mar 01 - 1945 Nov 30

  Reference

  HW 55/1

• Foreign Office Intercept (Y) Station Hawklaw, Fife, Scotland: Equipment, Works and...

  Held by

  The National Archives, Kew

  Date

  1943 May 19 - 1945 Nov 03

  Reference

  HW 55/6

• Dossier on RASTER. Notes on RASTER, a German Air, Army and Police stencil transposition...

  Held by

  The National Archives, Kew

  Date

  1944 Mar 01 - 1945 Jan 01

  Reference

  HW 50/55

• Foreign Office Intercept (Y) Station Brora, Sutherland, Scotland: Equipment, Works...

  Held by

  The National Archives, Kew

  Date

  1941 Oct 01 - 1945 Nov 30

  Reference

  HW 55/5

• Decrypts of intercepted diplomatic communications. Afghanistan: 15688, 15706, 15719-15720,...

  Held by

  The National Archives, Kew

  Date

  1924 Feb

  Reference

  HW 12/55

• Wavendon House, Wavendon, Buckinghamshire

  Held by

  The National Archives, Kew

  Date

  1940 Aug 01 - 1941 Sep 30

  Reference

  HW 64/55

• German Naval Organisation

  Held by

  The National Archives, Kew

  Date

  1944 Dec 08-1945 Jan 25

  Reference

  HW 18/55

• GC&CS Army and Air Force Sigint Volume XII: Traffic Analysis - High Echelon - German...

  Held by

  Creating government department or its successor

  Date

  1926 Jan 01 - 1945 Aug 30

  Reference

  HW 43/55

• Enemy exploitation of RAF WTI (wireless telegraphy intelligence) on the Western Front:...

  Held by

  The National Archives, Kew

  Date

  1944 Jun 15 - 1945 Apr 12

  Reference

  HW 40/55

• GCCS requests Treasury approval for four new Junior Assistant posts for new Sigint...

  Held by

  The National Archives, Kew

  Date

  1934

  Reference

  HW 3/55

• The Japanese naval air communications organisation

  Held by

  The National Archives, Kew

  Date

  1944 Jan 01-1945 Sep 30

  Reference

  HW 27/55

• Soviet Comintern messages: ISCOT 201-300

  Held by

  The National Archives, Kew

  Date

  1944 July 19-1944 Oct 2

  Reference

  HW 17/55

• Markings and callsigns of Italian aircraft

  Held by

  The National Archives, Kew

  Date

  1943 Nov 1-1943 Dec 31

  Reference

  HW 21/55

• Reports of decrypts of Japanese military attachés messages

  Held by

  The National Archives, Kew

  Date

  1944 Sep 13-1944 Sep 21

  Reference

  HW 35/55

• Commercial messages passed over diplomatic channels

  Held by

  Creating government department or its successor

  Date

  1946 May 01-1946 May 11

  Reference

  HW 32/55

• Albanian Directorate of Security messages including activity on Albanian/Greek border...

  Held by

  The National Archives, Kew

  Date

  1948 Sep 06 - 1948 Oct 21

  Reference

  HW 75/55

• Decrypts of Japanese army and army air force messages

  Held by

  The National Archives, Kew

  Date

  1944 Aug 01-1945 Jun 30

  Reference

  HW 52/55