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5 May, 2020 @ 2:00 pm - 3:15 pm


Tuesday 5th May – 2pm – St. Andrews United Reformed Church, Gerrards Cross

Ronald Koorm will be giving a talk and signing copies of his new book “Backing Bletchley”at St Andrews United Reformed Church, 12 Packhorse Road, Gerrards Cross SL9 7QE on Tuesday 5th May.

Ronald Koorm explores the complex relationship between Bletchley Park and its support codebreaking outstations, the background to the Enigma encoding machine, and how Eastcote became the largest codebreaking outstation during the war.

He analyses the development of improvements on Alan Turing’s Bombe machine, the contribution of the WRNS (Wrens) in operating the machines, and some of the social history showing how those Wrens from varying social backgrounds displayed outstanding teamwork under immense pressure at the codebreaking sites.

Post-war, Eastcote became GCHQ prior to moving to Cheltenham, and there were multiple uses of the site, including Cold War counter-inelligence operations. The author explores the link between Alan Turing and others in terms of the quest for Artificial Intelligence, and how talented individuals during the war helped shape the future. Backing Bletchley includes previously unpublished diagrams, charts and illustrations of the story of the outstations, which shed further light on the extraordinary historic events that occurred at them.

Tickets £10 to include tea and cake available from www.chilternbookshops.co.uk or

Gerrards Cross Bookshop 01753 885429 or

Chorleywood Bookshop 01923 283566

Backing Bletchley: The Codebreaking Outstations, From Eastcote to GCHQ RRP £20




5 May, 2020
2:00 pm - 3:15 pm


St. Andrews United Reform Church
12 Packhorse Road, Gerrards Cross SL9 7QE


Chorleywood Bookshop
01923 283566
View Organiser Website