Security officers to be appointed for each hut; security breach involving signal...

HW 14/35

1942 Apr 21-30

Security officers to be appointed for each hut; security breach involving signal from Hut 3, all copies to be destroyed; security talk by DCSS to all staff following careless talk by 2 former GCCS staff; Sir Alexander Cadogan of FO asks Minister of Labour Sir Horace J Wilson to exempt all GCCS staff from military service; new style of GCCS Sigint report to be introduced wef May 14 with examples and abbreviations, AS to start Bodo series of defensive and SALU reports Apr 26; suggested new rules for handling Sigint Ultra reports with GCCS comments; FV Freeborn's complaints about unsuitable/unskilled labour in the Machine Room, staff situation in Tabulating Department for round the clock working; 63 engineers required for BP processing machinery; staffing of SALU Section; minute from PG Lucas to HAS on points connected with Air Diary and SALU; AS fortnightly Research and Exploitation Reports, new draft establishment and pay rates for staff of RAF Section, achievements of Night Fighter Sub-section of RAF Section, visit by S/L JGG Moore of AS to HMS King George V at Scapa with case for shipborne Sigint positions manned by computors from Cheadle, RAF Section request for data on RAF Bomber Command operations to assist the Little Screw Sub-section, RAF Section GAF fighter patrol summary for Mar/Apr; IE daily Sigint highlights for EWT; overcrowding in the Chinese Section Room 22; HNS's terms of reference for naval advisors in Hut 3; statistics by P Twinn showing gap in Kriegsmarine intercept Apr 1-14; RSS report by HR Trevor Roper on Italian W/T network, author made persona non grata in Huts 3 and 4, letter from Trevor-Roper to C protesting about his banning from Huts 3 and 4 by EWT following his issuing of an allegedly incorrect Sigint report based on what GCCS described as limited knowledge, comments by HNS on the true identities of the Axis stations in Trevor-Roper's report; Apr monthly cryptographic report from Italian Military Section, problems with Italian intercept; cover situation on non-morse tasks, more sets and operators required and new site required in Kent; letter from Professor Lucas to EWT on his visit to an unspecified London intelligence department; move of 6 IS to BP, new despatch rider courier service to take intercept logs from UK Sigint stations to BP for processing; 62 SU Shefford requests training time in Hut 6 for its Sigint students; criticism by WH Walsh of Computor Sigint Courses held at Newbold Revel, selection for next Sigint Course at Newbold Revel; ATS on stand-by to supplement GCCS staff in detachment to GHQ in event of invasion of UK; diplomatic communications covered by PO stations at Brora, Cupar, Sandridge and Whitchurch; liaison with India, Canada, Mauritius and with Poles; correspondence with CBME, Director's Charter, terms of reference for Director CBME, ISOS cover in ME, Wing Cdr Humphreys to visit ME, ATS intercept unit in ME; German covert operation Isolde, off Iceland; YC plans to cover German non-morse communications; Abwehr intercept and decrypt of British instructions to French Resistance Apr 16; foreign secret agent material, English aircraft with French markings crashes in Spain Apr 19; POW interrogation report, German corporal describes E cypher machine in great detail; recommendations of Joint Services' meetings held at Broadway Buildings on Apr 22 and 25 on future of intercept of German non-morse communications; translated captured GAF document on 1400 airfields with identification features; frequency diversity tests at Chicksands and Beachy Head May 5-11; imminent deployment of GAF II and X Air Corps as reflected in Sigint; unprecedented ionosferic disturbance on Mar 5, paper with charts and graphs by AM Research Station at Great Baddow Chelmsford

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