In the 1970′s, after information about some of our wartime secrets had been released, some writers used this new found knowledge to sell books based upon a conspiracy theory. They alleged that certain authorities knew in advance that Coventry was to be targeted for a heavy raid, but in order to protect ULTRA (our deciphering of German codes using the captured ‘Enigma’ machine or other methods) our city was left to burn. Put simply, the conspiracy theorists tried to have us believe that if the citizens of Coventry had been given advance warning, then the Germans would have suspected that we’d broken their secret radio codes…
But still the conspiracy continued – based mainly on the fact that our use of ULTRA information had forewarned British Intelligence and Prime Minister Winston Churchill about the raid, but allegedely purposely not informed Coventry…
Surprisingly, one of the people directly involved in message decryption, Group Captain F. W. Winterbotham, was also one of those who helped to spread the conspiracy that Coventry was ‘left to burn’.
Coventry’s Blitz
http://www.historiccoventry.co.uk/
Conspiracies and myths
http://www.historiccoventry.co.uk/blitz/myths.php
“The Ultra Secret”
by Fredrick William Winterbotham