Hello Lukas and thanks for your reply.
Wow, was it really 6 years ago that I posted this question.
A lot of things have happened since then, and quite a few RAF research branches have I been along.
This photo was loaned to me by the son of a Bomber Command flight engineer who was part of a crew that I am interested in. I was told that the flight engineer is the man in the top left of the photo extract.
I had thought that the aircraft was a Hurricane and therefore that the FE had been on a fighter squadron. However, last year I applied for the service record of this man and it shows that he served at No.2 Air Gunners School, Dalcross (Inverness). This unit operated Bolton Paul Defiant aircraft - single-engined fighters with turrets - slightly larger than a Hurricane but from the front, could be confused.
So, I believe that the photo is of personnel of No.2 AGS; probably the permanent staff.
Also I think the aircraft is a Defiant.
The date is likely to be somewhere between September 1941 to October 1942.
Thanks and regards
Mike
I've attached a copy of the full photo.