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  Piece

  For file L1(C) on OVERLORD, see HW 40/6

  For file L1(C) on OVERLORD, see HW 40/6

  Held by

  The National Archives, Kew

  Date

  Reference

  HW 40/42

• Catalogue level

  Piece

  Accessions administration: HW 40

  Accessions administration: HW 40

  Held by

  The National Archives, Kew

  Date

  2000 Jan 1 - 2003 Dec 31

  Reference

  PRO 57/15770

• Catalogue level

  Item

  Appendix I Stockholm - see HW 15/40-42 for message texts

  Appendix I Stockholm - see HW 15/40-42 for message texts

  Held by

  The National Archives, Kew

  Date

  1940-1948

  Reference

  HW 15/61/17

• Catalogue level

  Piece

  Room 40: World War I official histories. Transferred to HW 3/180

  Room 40: World War I official histories. Transferred to HW 3/180

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/13

• Catalogue level

  Piece

  Room 40: World War I official histories. Transferred to HW 3/181

  Room 40: World War I official histories. Transferred to HW 3/181

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/14

• Catalogue level

  Piece

  Room 40: World War I official histories. Transferred to HW 3/176

  Room 40: World War I official histories. Transferred to HW 3/176

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/9

• Catalogue level

  Piece

  Room 40: World War I official histories. Transferred to HW 3/177

  Room 40: World War I official histories. Transferred to HW 3/177

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/10

• Catalogue level

  Piece

  Room 40: World War I official histories. Transferred to HW 3/179

  Room 40: World War I official histories. Transferred to HW 3/179

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/12

• Catalogue level

  Piece

  Room 40: World War I official histories. Transferred to HW 3/178

  Room 40: World War I official histories. Transferred to HW 3/178

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/11

• Catalogue level

  Piece

  Room 40: World War I official histories. Transferred to HW 3/182

  Room 40: World War I official histories. Transferred to HW 3/182

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/15

• Catalogue level

  Division

  General records of the Government Code and Cypher School

  COMMUNICATIONS SECURITY: Radio security service HW 35; Communications security HW 40; German signals intelligence Second World War

  Held by
  Date
  1914-1979
  Reference

• Catalogue level

  Piece

  British - General: enemy exploitation of codes and cyphers

  British - General: enemy exploitation of codes and cyphers

  Held by

  The National Archives, Kew

  Date

  1942 Aug 10 - 1948 Apr 22

  Reference

  HW 40/40

• 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

  Piece

  Records of WF Clarke of Room 40 and Head of Naval Section, Government Code and Cypher...

  Records of WF Clarke of Room 40 and Head of Naval Section, Government Code and Cypher School: items relating to aftermath of publication of the telegram (see also HW 3/2-30).

  Held by

  The National Archives, Kew

  Date

  1925-1927

  Reference

  HW 3/182

• Catalogue level

  Item

  Stockholm; 1. Mail sent to London with a Neighbour Stockholm; 2. Swedes reported...

  Stockholm; 1. Mail sent to London with a Neighbour Stockholm; 2. Swedes reported continuing to D/F the Soviet Fleet in the North Stockholm; 3. "K" reports that Swedes are reading telegrams.

  Held by

  The National Archives, Kew

  Date

  1941 Dec 12

  Reference

  HW 15/40/40

• Catalogue level

  Piece

  Activities of the Japanese Military Y Service

  Activities of the Japanese Military Y Service

  Held by

  The National Archives, Kew

  Date

  1941 Oct 27 - 1944 Dec 08

  Reference

  HW 40/201

• Catalogue level

  Piece

  Reflections of enemy exploitation of Chinese Army WTI (wireless telegraphy intelligence)

  Reflections of enemy exploitation of Chinese Army WTI (wireless telegraphy intelligence)

  Held by

  The National Archives, Kew

  Date

  1944 Jun 22 - 1945 Jul 10

  Reference

  HW 40/226

• Catalogue level

  Piece

  Other Allies - Intelligence (General): mostly reports

  Other Allies - Intelligence (General): mostly reports

  Held by

  The National Archives, Kew

  Date

  1943 Apr 07 - 1945 Aug 11

  Reference

  HW 40/145

• Catalogue level

  Piece

  Enemy exploitation of British Army WTI (wireless telegraphy intelligence): miscellaneous...

  Enemy exploitation of British Army WTI (wireless telegraphy intelligence): miscellaneous reports and correspondence

  Held by

  The National Archives, Kew

  Date

  1944 Feb 12 - 1945 Apr 04

  Reference

  HW 40/50

• Catalogue level

  Piece

  German Y Service: miscellaneous papers, including a report on the interrogation of...

  German Y Service: miscellaneous papers, including a report on the interrogation of 5 leading Nazis (JODL, DOENITZ, KEITEL, RIBBENTROP and GOERING) and a report on the German Intercept service between 1934 and 1939 by Wilhelm FLICKE

  Held by

  The National Archives, Kew

  Date

  1934 Jan 01 - 1949 Mar 09

  Reference

  HW 40/158