Frederick William Winterbotham (1897–1990) was a British Royal Air Force officer (latterly a Group Captain) who during World War II supervised the distribution of Ultra intelligence. His book The Ultra Secret was the first popular account of Ultra to be published in Britain. The Ultra Secret How The British Broke The German Code. https://sites.google.com/site/warrenbellauthor/
Alan Turing's office in Hut 6 at Bletchley Park. Note the renowned mug chained to the radiator! See also www.flickr.com/photos/briannegus/sets/72157601512721153/ Be comfortable and productive while you work ...
The Ultra Secret by F. W. Winterbotham. Operation Ultra was designed to intercept and decode World War II German signals sent using Enigma, the top-secret German cypher machine, a device so sophisticated that its existence was kept top secret until the 1970's. F.W. Winterbotham was the man responsible for the organization, distribution and security of Ultra. This is his personal account of the operation.
Ultra was the designation adopted by British military intelligence in June 1941 for wartime signals intelligence obtained by breaking high-level encrypted enemy radio and teleprinter communications at the Government Code and Cypher School at Bletchley Park. Ultra eventually became the standard designation among the western Allies for all such intelligence.