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• Catalogue level

  Piece

  Accessions administration: HW 23

  Accessions administration: HW 23

  Held by

  The National Archives, Kew

  Date

  1999 Jan 1 - 2003 Dec 31

  Reference

  PRO 57/15754

• Catalogue level

  Item

  See HW 15/25 1944 Aug 23

  See HW 15/25 1944 Aug 23

  Held by

  The National Archives, Kew

  Date

  1944 Dec 28

  Reference

  HW 15/27/85

• Catalogue level

  Item

  See HW 15/23, 1944 June 15

  See HW 15/23, 1944 June 15

  Held by

  The National Archives, Kew

  Date

  1944 Aug 12

  Reference

  HW 15/25/24

• Catalogue level

  Division

  General records of the Government Code and Cypher School

  JAPANESE MILITARY COMMUNICATIONS: Japanese naval decrypts HW 23, naval air decrypts HW 27, army airforce decrypts HW 28

  Held by

  Date

  1914-1979

  Reference

• 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

  Piece

  Japanese naval decrypts

  Japanese naval decrypts

  Held by

  The National Archives, Kew

  Date

  1943 Jul 01-1943 Jul 07

  Reference

  HW 23/23

• Catalogue level

  Item

  Name: HW [Henry Wright] Shepherd. Date of Birth: [unspecified]. Age: [23]. Place...

  Name: HW [Henry Wright] Shepherd.

  Held by

  The National Archives, Kew

  Date

  [1939-1945]

  Reference

  WO 416/327/24

• Catalogue level

  Item

  New York: Reference to the probable departure of "REST".

  New York: Reference to the probable departure of "REST".

  Held by

  The National Archives, Kew

  Date

  1944 June 15

  Reference

  HW 15/23/23

• Catalogue level

  Piece

  Naval Miscellaneous Papers 1941 Papers collected by Frank Birch detailing the operations...

  Naval Miscellaneous Papers 1941Papers collected by Frank Birch detailing the operations and organisation of the German Naval sub-section. The papers from June onwards reflect his appointment as Head of Naval Section and reorganisation of the whole se…

  Held by

  The National Archives, Kew

  Date

  1941 Jan 01-1941 Dec 29

  Reference

  HW 8/23

• Catalogue level

  Piece

  Minutes of VHF Sub-committee. The VHF Sub-committee was set up to coordinate investigations...

  Minutes of VHF Sub-committee. The VHF Sub-committee was set up to coordinate investigations into and arrange interception of enemy signals using frequencies above 30 Megahertz. It met 3 times between Aug 1941 and Jan 1942.

  Held by

  The National Archives, Kew

  Date

  1941 Aug 29-1942 Jan 03

  Reference

  HW 42/23

• Catalogue level

  Piece

  GC&CS Naval Sigint Volume XIII: Technical Intelligence and the Processing of Captured...

  GC&CS Naval Sigint Volume XIII: Technical Intelligence and the Processing of Captured Documents by Frank Birch

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01 - 1945 Aug 30

  Reference

  HW 43/23

• Catalogue level

  Piece

  Papers by K, R, Division (Security) regarding GCHQ enquiry, 'Sigint post-mortem',...

  Papers by K, R, Division (Security) regarding GCHQ enquiry, 'Sigint post-mortem', into Falklands Crisis; Directorate paper on performance of Sigint; Directorate review of Sigint performance and lessons; K Division signal responding to Commander Task …

  Held by

  The National Archives, Kew

  Date

  1982 July 12 - 1982 Oct 13

  Reference

  HW 92/23

• Catalogue level

  Piece

  Decrypts of intercepted diplomatic communications. Argentina: 6829-6830. Brazil:...

  Decrypts of intercepted diplomatic communications. Argentina: 6829-6830. Brazil: 6806-6807. Chile: 6943, 7018, 7107. Denmark: 6847. France: 6756. Germany: 6757, 6777 (contains a Turkish (Angora) diplomatic message), 6794, 6890, 6903, 6915, 6934, 6948…

  Held by

  The National Archives, Kew

  Date

  1921 June

  Reference

  HW 12/23

• Catalogue level

  Piece

  Emergency - CROSSBOW. Emergency arrangement for accommodation in the event of a German...

  Emergency - CROSSBOW. Emergency arrangement for accommodation in the event of a German V1 or V2 strike on Berkeley Street

  Held by

  The National Archives, Kew

  Date

  1943 Nov 09 - 1944 Aug 15

  Reference

  HW 53/23

• Catalogue level

  Piece

  Staffing problems at BP; weekly status reports on resources for E intercept; weekly...

  Staffing problems at BP; weekly status reports on resources for E intercept; weekly staff returns for BP showing gains and losses, list of likely academic candidates for work at GCCS, GCCS bid to Treasury for significant increase in establishment, Di…

  Held by

  The National Archives, Kew

  Date

  1941 Nov 16-30

  Reference

  HW 14/23

• Catalogue level

  Piece

  Chief of Intelligence Staff East Indies Station to Director of Naval Intelligence,...

  Chief of Intelligence Staff East Indies Station to Director of Naval Intelligence, Admiralty: comment, based on Anderson's estimate, on local agreement with Japanese at Rangoon

  Held by

  The National Archives, Kew

  Date

  1945 Sept 7

  Reference

  HW 4/23

• Catalogue level

  Piece

  Security implications of private correspondence

  Security implications of private correspondence

  Held by

  The National Archives, Kew

  Date

  1942 Feb 13 - 1946 Jan 24

  Reference

  HW 64/23

• Catalogue level

  Piece

  Commercial reports

  Commercial reports

  Held by

  The National Archives, Kew

  Date

  1940 Mar 30-1940 Mar 31

  Reference

  HW 29/23

• Catalogue level

  Piece

  Including military situation reports from Eastern Front

  Including military situation reports from Eastern Front

  Held by

  The National Archives, Kew

  Date

  July 13 1941-July 21 1941

  Reference

  HW 5/23

• Catalogue level

  Piece

  Vol X The German Navy - Surface and Air Forces by Lieutenant Commander L A Griffiths,...

  Vol X The German Navy - Surface and Air Forces by Lieutenant Commander L A Griffiths, RNVR and Owen R Stinchcombe

  Held by

  The National Archives, Kew

  Date

  1939 - 1945

  Reference

  HW 11/23