Martin,
I am impressed with what you have been able to discover and share with us about the Lanc that Dad was flying - very interesting. I believe that Dad's friend, Bob Giffin, is buried at St. Cloud-en-Dunois. Bob was seriously injured during the attack of July 28, 1944.
Talking to Dad last night he mentioned that the Halifax and Lancaster Mk 2 looked very similar from behind, at night it would be easy to make a mistake.

Regards, E.W. Campbell