Re Cadix
A radio link to the UK has been established, and worked for a while. I hope the link works, it provides some more information. The Enigma story deserves a good book, but I am not sure anybody is capable to tackle it. The only book available in English is rather old. Kozaczuk, Władysław (1984), Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two.
https://translate.google.pl/translat...arian_Rejewski
Re Vengeance
Such units and aircraft simply avoided attention of historians - no glamour!