Sir John Dermot Turing, 12th Baronet Turing, is a nephew of “the” Alan Turing.
An author as well as a lawyer and a Ph.D. geneticist, he has written several books on the real Alan Turing (who didn’t much resemble the character played by Benedict Cumberbatch in The Imitation Game). Here he is in a lecture about the origins of the Enigma code breaking effort. Enjoy!
And here is another lecture, at Oxford University https://youtu.be/tCFp78trzU8
[Buried in work up to my ears. Hopefully back to scheduled programming soon.]
Spin, strangeness, and charm 
For anyone daunted by the length of this vid–give it a try. I think you’ll find it absorbing from end to end