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  General records of the Government Code and Cypher School

  GC&CS ADMINISTRATION: Establishments records HW 64.RESEARCH SECTION: Weekly reports, memoranda and minutes HW 78.

  Held by

  Date

  1914-1979

  Reference

• Catalogue level

  Series

  Government Code and Cypher School: Research Section: Memoranda, Minutes and Weekly...

  Reports made on a weekly basis by the Research Section and memoranda including notes on German diplomatic code and traffic received.Minutes of meetings of the Directing Sub-Committee of the Research Section.

  Held by

  The National Archives, Kew

  Date

  1941-1944

  Reference

  HW 78

• Catalogue level

  Piece

  Notes on ISSIS [Inter-Service Special Intelligence School] and Japanese NS [Naval...

  Notes on ISSIS [Inter-Service Special Intelligence School] and Japanese NS [Naval Section] Linguists and Courses. Historical notes on the training of linguists (mainly in Japanese) at the ISSIS in Bedford

  Held by

  The National Archives, Kew

  Date

  1940 Oct 16 - 1945 Nov 10

  Reference

  HW 50/78

• Catalogue level

  Piece

  N.S.IIIJ Memorandum 1-9. Intelligence and technical notes in support of the watch...

  N.S.IIIJ Memorandum 1-9.Intelligence and technical notes in support of the watch keepers charged with current intelligence reporting on the Japanese Navy.

  Held by

  The National Archives, Kew

  Date

  1943 Dec 01-1944 Mar 26

  Reference

  HW 8/78

• Catalogue level

  Piece

  Signals containing results of interrogations by counter intelligence officers of...

  Signals containing results of interrogations by counter intelligence officers of suspected enemy collaborateurs and agents

  Held by

  The National Archives, Kew

  Date

  1944 Jan 01-1945 Jan 31

  Reference

  HW 41/78

• Catalogue level

  Piece

  Reports in the series VM/5001 to VM/5250.

  Reports in the series VM/5001 to VM/5250.

  Held by

  The National Archives

  Date

  1943 Feb 26-1943 Mar 01

  Reference

  HW 20/78

• Catalogue level

  Piece

  Decrypts of medium/low grade German naval cypher messages

  Decrypts of medium/low grade German naval cypher messages

  Held by

  The National Archives, Kew

  Date

  1944 Apr 22-1944 Jun 28

  Reference

  HW 18/78

• Catalogue level

  Piece

  PS Milner-Barry to deputise for WG Welchman as Head of Hut 6 June 1, Milner-Barry...

  PS Milner-Barry to deputise for WG Welchman as Head of Hut 6 June 1, Milner-Barry and Welchman to exchange rooms, first edition of Breaking Possibilities by Hut 6 Research Party June 1 giving state of exploitation of German keys, Welchman to EWT on s…

  Held by

  The National Archives, Kew

  Date

  1943 June 1-10

  Reference

  HW 14/78

• Catalogue level

  Piece

  Research Section: minutes of meetings of Directing Sub-Committee, memoranda including...

  Research Section: minutes of meetings of Directing Sub-Committee, memoranda including notes on German diplomatic code and traffic received but not read at GC&CS

  Held by

  The National Archives, Kew

  Date

  1941 Apr 08 - 1942 Jan 23

  Reference

  HW 78/1

• Catalogue level

  Piece

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

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

  Held by

  The National Archives, Kew

  Date

  Apr 2 1942-Apr 5 1942

  Reference

  HW 5/78

• Catalogue level

  Piece

  Comintern messages: LONDON AND BERLIN concerning despatch of money to Indian revolutionary...

  Comintern messages: LONDON AND BERLIN concerning despatch of money to Indian revolutionary movement

  Held by

  The National Archives, Kew

  Date

  1932 June 11

  Reference

  HW 17/78

• Catalogue level

  Piece

  Research Section weekly reports

  Research Section weekly reports

  Held by

  The National Archives, Kew

  Date

  1943 Mar 01 - 1944 Jan 18

  Reference

  HW 78/2

• Catalogue level

  Piece

  Yugoslav Army Field Post Number messages. Yugoslav Navy messages concerning personalities....

  Yugoslav Army Field Post Number messages. Yugoslav Navy messages concerning personalities. Yugoslav Air Force messages covering aircraft types and numbers, personalities and units. One report covers messages concerning the identification and movement…

  Held by

  The National Archives, Kew

  Date

  1949 Jan 04 - 1950 Aug 14

  Reference

  HW 75/78

• Catalogue level

  Piece

  Enemy pulse and VHF transmissions

  Enemy pulse and VHF transmissions

  Held by

  The National Archives, Kew

  Date

  1940 Mar 23-1942 Aug 17

  Reference

  HW 2/78

• Catalogue level

  Piece

  Reports of Japanese army air decrypts with subject headers

  Reports of Japanese army air decrypts with subject headers

  Held by

  The National Archives, Kew

  Date

  1945 Mar 17-1945 Jul 19

  Reference

  HW 28/78

• Catalogue level

  Piece

  92433-93242

  92433-93242

  Held by

  The National Archives, Kew

  Date

  1945 Jan 17-1945 Jan 31

  Reference

  HW 19/78

• Catalogue level

  Piece

  Reports on GAF Western Front Defences

  Reports on GAF Western Front Defences

  Held by

  The National Archives, Kew

  Date

  1944 Jan 1-1944 Feb 26

  Reference

  HW 13/78

• Catalogue level

  Piece

  Anti-aircraft 3rd Brigade to move to Romania for operations in Ploesti area: anti-aircraft...

  Anti-aircraft 3rd Brigade to move to Romania for operations in Ploesti area: anti-aircraft defence in Romania and Bulgaria to be subordinated to 10th Anti Aircraft Division. Aircraft mines for use in Black Sea reported to be unusable. Aerodrome Regio…

  Held by

  The National Archives, Kew

  Date

  1941 Sept 20

  Reference

  HW 1/78

• Catalogue level

  Piece

  Bletchley Park recreational club

  Bletchley Park recreational club

  Held by

  The National Archives, Kew

  Date

  1942 Oct 01 - 1944 Mar 31

  Reference

  HW 64/78

• Catalogue level

  Piece

  Commercial reports

  Commercial reports

  Held by

  The National Archives, Kew

  Date

  1941 Feb 19-1941 Feb 28

  Reference

  HW 29/78