Churchill refused to save Coventry to hide the fact that the Enigma code was broken. And that's not the only example. What was the point of breaking Enigma code if it wasn't used to save people?
This is a now discredited claim from a 1974 book The Ultra Secret written by Group Captain F. W. Winterbotham. Winterbotham was involved in the distribution of Ultra intelligence and his was the very first book in English about the breaking of the Enigma code, so his claims were of considerable interest.
As an aside, it is truly remarkable that for nearly thirty years after the end of the war, not a single person, out of the thousands who worked at Bletchley Park, broke ranks and spoke publicly about Ultra.
However, since 1996 the Ultra decrypts for the period have been declassified and it is clear that, although it was known that a raid codenamed Mondschein Sonate (Moonlight Sonata) would take place that night, it was assumed that the target would be London.
Ultra decrypts were always subject to extreme levels of security and only disseminated through dedicated special liaison units attached to major headquarters.
Immense care was taken to disguise the source of the decrypts by providing other plausible sources for the intelligence and it is not inconceivable that cases could have arisen where the need to protect Ultra overrode the value of a specific piece of intelligence and caused its suppression. However, this was not the case with the Coventry Raid.
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