Catalogue description EWT order to Service Chiefs, with comments from HAS and AD (S) on handling of Ultra...

EWT order to Service Chiefs, with comments from HAS and AD (S) on handling of Ultra material; reorganisation of Research Section in Hut 3 under FL Lucas; EWT to DCSS, Col Vivian, on staff security problem, outside personal contact to be investigated; EWTnotes for BP security officers; security and reliability of Hollerith encyphering machine, modification of Type X equipment, Type X equipment for BP; letter from Gordon Welchman, Head of Hut 6, to Nigel de Grey, (AD (S) apologising for his outburst earlier that day, summarises Hut 6 problems which mainly revolved around the morale of his female staff; BP reports on German Sigint Organisation, 6 IS report on German Sigint DF organisation; 3 ATS decoders for Hut 6 to be detached to GHQ Home Forces in event of invasion; MEW letter to AGD asking for more Sigint from Canada on Far East; Director WRNS and WRNS Superintendent The Nore to visit BP on June 8, case for commissioning some BP Wrens, new officer posts required for supervision; access of RSS officer Capt Trevor-Roper to BP, EWT to C agreeing to ban him, support from SIS, RSS Group 8 Italian net subject for disagreement between Trevor Roper and GCCS, RSS intercepts Soviet diplomatic traffic; French Resistance traffic sent to SIS from GCCS; handling of ISOS material both at BP and in ME; new aerial to improve reception at PO station at Brora; liaison with Colombo, India and Canada, 21-page report on Canadian Sigint organisation by Capt HR Sandwith of British Admiralty, compiled at Ottawa during his visit to North America for the CANUKUS Sigint Conference in Washington; correspondence with CBME, case for continuing Sigint in Malta, Air Marshal Tedder's assessment of German ME plans - to capture Malta, congratulatory signal to BP from Air Marshal Tedder, AOC-in-C ME, German intentions in ME - a Sigint appreciation, JIC (MEF) assessment of German intentions in Libya based on BP Sigint reports, results of monitoring exercise on British military comms in ME and W Africa with recommendations for improvements, German Sigint reports on RAF delivery flights to Gibraltar - evaluation by AM AI 4B, RSS and GCCS cover in ME, results of monitoring exercise on British military comms in ME and W Africa with recommendations for improvements; YC note on German development of non-morse comms; agenda for Inter-Services Cypher Security Committee meeting, security of UK cypher systems; support for Bomber Command from RAF Kingsdown; monitoring of Coastal Command air/ground comms by RAF Cheadle; AM suggestions for coordination and selection of transmissions of Special or MSS material to various commands overseas