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• Italian naval messages

  Held by

  The National Archives, Kew

  Date

  1939 Mar 14-1939 Apr 20

  Reference

  HW 18/48

• Salaries of GCCS telegraphists

  Held by

  The National Archives, Kew

  Date

  1922

  Reference

  HW 3/48

• Fire prevention at GC&CS

  Held by

  The National Archives, Kew

  Date

  1944 Jan 01 - 1945 Jul 23

  Reference

  HW 64/48

• Enemy exploitation of British Army air support codes and cyphers: miscellaneous reports...

  Held by

  The National Archives, Kew

  Date

  1943 Oct 04 - 1946 Nov 12

  Reference

  HW 40/48

• Intelligence reports and correspondence concerning German preparations for the invasion...

  Held by

  The National Archives, Kew

  Date

  1940 May 17-1941 Mar 04

  Reference

  HW 48/1

• "Raiders" by Charles Morgan May 1944 Havoc on the trade routes caused by German warships...

  Held by

  The National Archives, Kew

  Date

  1939 Aug 05-1944 May 03

  Reference

  HW 8/48

• Commercial messages passed over diplomatic channels

  Held by

  Creating government department or its successor

  Date

  1945 Nov 01-1945 Nov 30

  Reference

  HW 32/48

• Notes on numbers: transport units and aircraft works numbers

  Held by

  The National Archives, Kew

  Date

  1943 Feb 28

  Reference

  HW 21/48

• Signals concerning Hollerith machinery

  Held by

  The National Archives, Kew

  Date

  1940 Dec 23 - 1944 Feb 05

  Reference

  HW 51/48

• Reports of Japanese naval air decrypts and messages

  Held by

  The National Archives, Kew

  Date

  1945 Jul 01-1945 Oct 01

  Reference

  HW 27/48

• Reports of Japanese army air decrypts with subject headers

  Held by

  The National Archives, Kew

  Date

  1944 Sep 01-1944 Nov 10

  Reference

  HW 28/48

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

  Held by

  The National Archives, Kew

  Date

  1943 Apr 01-1943 Apr 30

  Reference

  HW 41/48

• GRU (Soviet Intelligence) Military Attaché Traffic: Moscow with New York, USA. (Described...

  Held by

  The National Archives, Kew

  Date

  1941 Mar 29-1943 Sept 28

  Reference

  HW 15/48

• Japanese naval decrypts

  Held by

  The National Archives, Kew

  Date

  1943 Nov 19-1943 Nov 20

  Reference

  HW 23/48

• Verbatim German language message texts in GP Roulette Code

  Held by

  The National Archives, Kew

  Date

  1944 Apr-Nov

  Reference

  HW 16/48

• German section: reports of German army and air force high grade machine decrypts

  Held by

  The National Archives, Kew

  Date

  Dec 23 1941-Dec 26 1941

  Reference

  HW 5/48

• Japanese consul-general, Calcutta: visit to Berlin by Sarat Chandra Bose, Indian...

  Held by

  The National Archives, Kew

  Date

  1941 Sept 5

  Reference

  HW 1/48

• Decrypts of intercepted diplomatic communications. Afghanistan: 13672, 13806, 13884....

  Held by

  The National Archives, Kew

  Date

  1923 July

  Reference

  HW 12/48

• San Francisco: Departure of "PRIVATE".

  Held by

  The National Archives, Kew

  Date

  1944 Apr 30

  Reference

  HW 15/30/48

• Stockholm; "ULRIK" reports naval and military intelligence from Germany and Norway.

  Held by

  The National Archives, Kew

  Date

  1943 Nov 21

  Reference

  HW 15/13/48