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 analyzes 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 in how those Wrens supported the codebreaking sites. Post -war, Eastcote became GCHQ prior to moving to Cheltenham, and there were multiple uses of the site, including anti-spy 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 our future. Backing Bletchley includes previously unpublished diagrams, charts, and illustrations of the story of the outstations, which should further inform the reader as to the extraordinary historical events that occurred.