On catch-up TV I just watched "
Bletchley Park: Code-breaking's Forgotten Genius" about the Hut 6 cryptographer Gordon Welchman. His contribution to the task was on a par with that of Alan Turing apparently but in a very different way.
The most interesting aspect IMO was approach to the task and his post war life when partly due to British spending cuts he continued his work in the USA. It seems that much of what he did now underpins present day security methods, including the use of the internet by any one of us! Hi guys!
The book he wrote wasn't actually banned but made him persona non grata in security circles who gave him a rough ride. It's called 'THE HUT SIX STORY : BREAKING THE ENIGMA CODES' and if you want it today, it will cost you £354 on Amazon co uk
On French Amazon you can still order it, new, for 13 Euros.
It seems that if you were a British technological genius during WW2 then you had to tread very carefully once you were expendable.