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• ISL from C PM's comments and Naval Headlines: instruction to U-boats' action to be...

  Held by

  The National Archives, Kew

  Date

  1941 Sept 5

  Reference

  HW 1/47

• British supervision of Polish (London Government in exile and associated military...

  Held by

  The National Archives, Kew

  Date

  1942 Dec 11-1946 Jan 26

  Reference

  HW 47/4

• Italian naval messages

  Held by

  The National Archives, Kew

  Date

  1939 Feb 06-1939 Mar 14

  Reference

  HW 18/47

• Security of electronic communications

  Held by

  Creating government department or its successor

  Date

  1954 Mar-1954 June

  Reference

  HW 9/47

• Ministerial correspondence on GCCS pay

  Held by

  The National Archives, Kew

  Date

  1922

  Reference

  HW 3/47

• Commercial reports

  Held by

  The National Archives, Kew

  Date

  1940 Aug 24-1940 Aug 31

  Reference

  HW 29/47

• German Air Force. The RAF 'Y' Organisation in the Mediterranean January 1941 - January...

  Held by

  The National Archives, Kew

  Date

  1941 Jan 01 - 1946 Apr 25

  Reference

  HW 50/47

• Enemy exploitation of British Army codes and cyphers from miscellaneous sources....

  Held by

  The National Archives, Kew

  Date

  1943 Jan 01 - 1944 Dec 31

  Reference

  HW 40/47

• London Poles, Stanmore, Middlesex, and the Russian Section at GC&CS 16/8/1940 Letter...

  Held by

  The National Archives, Kew

  Date

  1940 Nov 01-1941 Sep 02

  Reference

  HW 47/1

• Series/3700 (Polish), reports on Polish diplomatic/military communications in Western...

  Held by

  The National Archives, Kew

  Date

  1945 Nov 02-1946 Feb 25

  Reference

  HW 47/3

• Mainly Romanian Special Service of Information reports on monitoring of suspected...

  Held by

  The National Archives, Kew

  Date

  1949 Dec 28 - 1950 Jun 26

  Reference

  HW 75/47

• Reports in the series QT/7251 to QT/7500.

  Held by

  The National Archives

  Date

  1942 Nov 29-1942 Dec 01

  Reference

  HW 20/47

• Reports of decrypts of Japanese military attachés messages

  Held by

  The National Archives, Kew

  Date

  1944 Jul 10-1944 Jul 15

  Reference

  HW 35/47

• Italian Air Force: analysis of transport activity

  Held by

  The National Archives, Kew

  Date

  1942 Sept 1-1942 Dec 31

  Reference

  HW 21/47

• Decrypts of Japanese army and army air force messages

  Held by

  The National Archives, Kew

  Date

  1944 Aug 01-1945 May 31

  Reference

  HW 52/47

• Reports teleprinted from Malta to the Air Ministry and passed to the Government Code...

  Held by

  The National Archives, Kew

  Date

  1943 Jan 01-1943 Mar 31

  Reference

  HW 41/47

• Liaison between CBME and GC&CS on cryptographic matters, particularly Romanian cyphers

  Held by

  The National Archives, Kew

  Date

  1941 Dec 08 - 1944 Mar 02

  Reference

  HW 51/47

• Admiralty Use of Special Intelligence in Naval Operations by Capt. G.E. Colpoys R.N.

  Held by

  The National Archives, Kew

  Date

  1939 Aug 23-1945 Apr 09

  Reference

  HW 8/47

• GRU (Soviet Intelligence) Military Attaché Traffic: Moscow with London, United Kingdom....

  Held by

  The National Archives, Kew

  Date

  1947 Jan 1-1947 Mar 8

  Reference

  HW 15/47

• Japanese naval decrypts

  Held by

  The National Archives, Kew

  Date

  1943 Nov 16-1943 Nov 18

  Reference

  HW 23/47