India Four Two - how lucky you were to be taught by the great man! What a life he had. Love the water-diviners story. As you'll know, geology is much under-appreciated topic that sort you out with the basics when you need it most ;-)
Ted Rose has done an amazing job with colleagues of telling the D-Day geological story. There's little chance of us adding anything new on the bigger picture (perhaps just a new audience), but we might be getting somewhere in shining a new light on the aviation portion.
With the help of the DH Museum archivists, we may even have a candidate for the actual airframe(s) he used for those brave pieces of aerial geology fieldwork. Hopefully you can read the key.aero link:
https://www.key.aero/comment/2012638#comment-2012638