Hell of a lecture accompanied by some amazing slides, you missed something there. Dick was a flight engineer on Sunderlands, then No.1 flight (test) engineer on the Saunders Roe Princess, ran flight testing of the Saunders Roe rocket fighter, and went on to be head of helicopter development. He proudly proclaimed himself to be 81½, and had spent a great deal of time at Boscombe Down - so probably the same fellow that you knew.
I've got his address, will PM it to you next week (temporarily displaced from address book).
G