| Scope and content |
General records of the Government Code and Cypher School (GCCS) and Government Communications Headquarters (GCHQ) relating to responsibilities for intercepting enemy communications, particularly during the Second World War, and for ensuring security of the government's electronic communications.
Consists of:
Senior management papers - Daily correspondence between the Prime Minister and the Director of GCCS, 1940-1945: HW 1 and HW 71
- Second World War intelligence summaries based on signals intelligence: HW 13
- Second World War policy papers: HW 14
- Tactical HW 20, and political HW 39 signals intelligence forwarded to allied commands
- Directorate and senior committee papers: HW 42
- Second World War in the Far East, summary reports: HW 44
- Air Section reports: HW 56
- Y Board and Sigint Board correspondence: HW 69
Soviet communications - Venona Project reports: HW 15
- Decrypts of Communist International intercepts 1934-1937: HW 17
Japanese military communications - Naval Section reports of Japanese naval decrypts: HW 23
- Naval and Air Section reports of Japanese naval air decrypts: HW 27
- Air Section reports of Japanese army airforce decrypts: HW 28
- Army section reports of Japanese army decrypts HW 33, military attachees decrypts HW 34, and military intelligence decrypts HW 46
- Japanese Section correspondence and earlier papers on Japanese matters: HW 67
Histories and personal papers - Personal papers, unofficial histories and miscellaneous records, 1914-1945: HW 3
- Official war histories for the First and Second World Wars written by GCCS staff: HW 7 and HW 11
- Histories of various aspects of work at Bletchley Park: HW 25 and HW 43
- Unit histories for Special Liaison Units: HW 49
- Papers on the writing of the history of British signals intelligence: HW 50
- Papers relating to the comsec Editing of Winston Churchill's 'The Second World War' are in: HW 72
German military communications - German Section decrypts of German armed forces signals and of German and Italian intelligence services signals from 1940, German police messages and German Secret Service messages: HW 5, HW 16, HW 19 and HW 45
- Naval Section reports of German, Italian, French, Spanish and Portuguese naval decrypts: HW 18
- Reports on German plans for the sea-born invasion of Britain: HW 48
- Hut 6 and Hut 8 Weekly Reports: HW 77
Bulgarian, Croatian, French, Iranian, Italian Portuguese and Spanish communications - German Section decrypts of German armed forces signals and of German and Italian intelligence services signals from 1940, German police messages and German Secret Service messages: HW 5, HW 16, HW 19 and HW 45
- Naval Section reports of German, Italian, French, Spanish and Portuguese naval decrypts: HW 18
- Air Section reports on Italian and other foreign air forces: HW 21
- Naval, Air and Military Sections reports of Spanish military and civilian activity: HW 22
- Decrypts of Bulgarian military attache messages: HW 24
- Army section reports on Croatian military and naval activity: HW 26
- Intercepts of Iranian communications: HW 58
- Reports of Bulgarian Danube river and naval port authority decrypts: HW 70
Diplomatic, commercial and meteorological communications - Japanese Section summary reports from intercepted Japanese and Siamese diplomatic communications: HW 10 and HW 38
- Decrypts of diplomatic intercepts from 1919: HW 12 and HW 37
- Commercial Section reports: HW 29
- Japanese Commercial Section: HW 30
- Diplomatic and Commercial Section reports: HW 32
- German diplomatic communications: HW 36
- Records of the Diplomatic and Commercial Sections: HW 53
- Intercepts of meteorological reports: HW 54
Liaison with allied organisations - Polish business and activities files: HW 47
- Records of liaison with US based intelligence organisations: HW 57
- Intelligence related allied cypher messages: HW 74
Communications security - Radio security service interception of enemy illicit wireless communications, HW 35
- Communications security: HW 40
- German signals intelligence in the Second World War: HW 73
Field signals intelligence - Field signals intelligence: HW 41
- Collection and analysis of communications in the Middle East and North Africa: HW 68
Technical matters - 'Y' Station maintenance records: HW 55
- Air Section correspondence, analytical and technical matters: HW 66
Intercepted plain language communications - Reports of plain language code are in HW 29
Wireless Telegraph Section - Wireless Telegraphy Coordinator Section records: HW 63
GC&CS Administration: - Establishments records: HW 64
Research Section: - Weekly reports, memoranda and minutes: HW 78
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