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  General records of the Government Code and Cypher School

  TECHNICAL MATTERS: 'Y' Station HW 55; Air Section HW 66.

  Held by

  Date

  1914-1979

  Reference

• 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

  Item

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

  Moscow with San Francisco, USA. San Francisco; (Comments about individual probably sympathetic to USSR.)

  Held by

  The National Archives, Kew

  Date

  1945 Aug 11

  Reference

  HW 15/55/55

• Catalogue level

  Piece

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

  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

• Catalogue level

  Piece

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

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

  Held by

  The National Archives, Kew

  Date

  1943 May 19 - 1945 Nov 03

  Reference

  HW 55/6

• Catalogue level

  Piece

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

  Dossier on RASTER. Notes on RASTER, a German Air, Army and Police stencil transposition cypher, introduced in September 1944 as the type of non-machine cypher most closely associated in use and content with ENIGMA

  Held by

  The National Archives, Kew

  Date

  1944 Mar 01 - 1945 Jan 01

  Reference

  HW 50/55

• Catalogue level

  Piece

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

  Foreign Office Intercept (Y) Station Brora, Sutherland, Scotland: Equipment, Works and Buildings

  Held by

  The National Archives, Kew

  Date

  1941 Oct 01 - 1945 Nov 30

  Reference

  HW 55/5

• Catalogue level

  Piece

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

  Decrypts of intercepted diplomatic communications. Afghanistan: 15688, 15706, 15719-15720, 15741, 15802-15805, 15816, 15820, 15841, 15849, 15863, 15892-15893, 15920-15921, 15927, 15961, 15982. Belgium: 15879, 15948. France: 15682, 15696-15697, 15721-…

  Held by

  The National Archives, Kew

  Date

  1924 Feb

  Reference

  HW 12/55

• Catalogue level

  Piece

  Wavendon House, Wavendon, Buckinghamshire

  Wavendon House, Wavendon, Buckinghamshire

  Held by

  The National Archives, Kew

  Date

  1940 Aug 01 - 1941 Sep 30

  Reference

  HW 64/55

• Catalogue level

  Piece

  German Naval Organisation

  German Naval Organisation

  Held by

  The National Archives, Kew

  Date

  1944 Dec 08-1945 Jan 25

  Reference

  HW 18/55

• Catalogue level

  Piece

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

  GC&CS Army and Air Force Sigint Volume XII: Traffic Analysis - High Echelon - German by J E S Cooper

  Held by

  Creating government department or its successor

  Date

  1926 Jan 01 - 1945 Aug 30

  Reference

  HW 43/55

• Catalogue level

  Piece

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

  Enemy exploitation of RAF WTI (wireless telegraphy intelligence) on the Western Front: miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1944 Jun 15 - 1945 Apr 12

  Reference

  HW 40/55

• Catalogue level

  Piece

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

  GCCS requests Treasury approval for four new Junior Assistant posts for new Sigint bureau proposed for Hong Kong

  Held by

  The National Archives, Kew

  Date

  1934

  Reference

  HW 3/55

• Catalogue level

  Piece

  The Japanese naval air communications organisation

  The Japanese naval air communications organisation

  Held by

  The National Archives, Kew

  Date

  1944 Jan 01-1945 Sep 30

  Reference

  HW 27/55

• Catalogue level

  Piece

  Soviet Comintern messages: ISCOT 201-300

  Soviet Comintern messages: ISCOT 201-300

  Held by

  The National Archives, Kew

  Date

  1944 July 19-1944 Oct 2

  Reference

  HW 17/55

• Catalogue level

  Piece

  Markings and callsigns of Italian aircraft

  Markings and callsigns of Italian aircraft

  Held by

  The National Archives, Kew

  Date

  1943 Nov 1-1943 Dec 31

  Reference

  HW 21/55

• Catalogue level

  Piece

  Reports of decrypts of Japanese military attachés messages

  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

• Catalogue level

  Piece

  Commercial messages passed over diplomatic channels

  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

• Catalogue level

  Piece

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

  Albanian Directorate of Security messages including activity on Albanian/Greek border and Albanian/Yugoslav relations

  Held by

  The National Archives, Kew

  Date

  1948 Sep 06 - 1948 Oct 21

  Reference

  HW 75/55

• Catalogue level

  Piece

  Decrypts of Japanese army and army air force messages

  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