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• Accessions administration: HW 45

  Held by

  The National Archives, Kew

  Date

  2001 Jan 1 - 2002 Dec 31

  Reference

  PRO 57/15775

• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• Weekly summary reports on Second World War German army and air force communications

  Held by

  The National Archives, Kew

  Date

  1945 Jan 13-1945 Feb 03

  Reference

  HW 45/45

• Government Code and Cypher School: Reports on Second World War German Army and Air...

  Held by

  The National Archives, Kew

  Date

  1941-1945

  Reference

  HW 45

• Security of electronic communications

  Held by

  Creating government department or its successor

  Date

  1954 Mar-1955 Mar

  Reference

  HW 9/45

• Billeting for staff at Bletchley Park and Eastcote, Middlesex

  Held by

  The National Archives, Kew

  Date

  1939 Aug 29 - 1946 Apr 10

  Reference

  HW 64/45

• Enemy exploitation of British Army low grade codes and cyphers: miscellaneous reports...

  Held by

  The National Archives, Kew

  Date

  1941 Nov 25 - 1943 Sep 30

  Reference

  HW 40/45

• Naval Section History Editorial Committees and allocation of historical tasks.

  Held by

  The National Archives, Kew

  Date

  1946 Jan 24-1946 Jul 31

  Reference

  HW 8/45

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

  Held by

  The National Archives, Kew

  Date

  1942 Jan 01-1942 Jun 30

  Reference

  HW 41/45

• UKUSA Sigint relations: cooperation with FBI on UKUSA intercept and processing of...

  Held by

  The National Archives, Kew

  Date

  1940 July-1941 Dec

  Reference

  HW 14/45

• Reports based on messages sent on the Italian naval command network

  Held by

  The National Archives, Kew

  Date

  1942 Mar 28-1942 Nov 21

  Reference

  HW 18/45

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

  Held by

  The National Archives, Kew

  Date

  1945 Sept 1-1945 Oct 20

  Reference

  HW 15/45

• Decrypts of intercepted diplomatic communications. Afghanistan: 12970, 12986-12987,...

  Held by

  The National Archives, Kew

  Date

  1923 Apr

  Reference

  HW 12/45

• Details of the German fighter patrol code book derived from traffic analysis and...

  Held by

  The National Archives, Kew

  Date

  1941 May 02-1943 Jul 12

  Reference

  HW 45/50

• Pay and conditions of GCCS temporary staff

  Held by

  The National Archives, Kew

  Date

  1922

  Reference

  HW 3/45

• Weekly reports on Second World War German army and air force communications

  Held by

  The National Archives, Kew

  Date

  1942 Aug 15-1942 Oct 02

  Reference

  HW 45/6

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

  Held by

  The National Archives, Kew

  Date

  Dec 12 1941-Dec 16 1941

  Reference

  HW 5/45

• Commercial reports. Report number 11299 missing at transfer

  Held by

  The National Archives, Kew

  Date

  1940 Aug 14-1940 Aug 15

  Reference

  HW 29/45

• Personalities referred to in Romanian Police / Special Service of Information traffic

  Held by

  The National Archives, Kew

  Date

  1946 Oct 15 - 1947 Jun 26

  Reference

  HW 75/45

• Signals concerned with Bags communications

  Held by

  The National Archives, Kew

  Date

  1941 Aug 07 - 1944 Mar 10

  Reference

  HW 51/45