Genghis the Engineer
Yes, Dick has posted, I found it and then couldn't get back to it. Just tried again with success.
Go to the post from dereknf and click on his "Lancaster questions". Up comes Dick 1939 with his precise version of events, as one would expect.
Knowing all the crew I had a wry smile when he mentions that they would only complete the trip if he was on board, only half joking I suspect.