I see you have posted one of "my"pics above of JB910 (chaddy's content). That photograph was taken in late May 1943 after the mid upper turret had been (re)fitted. I know for a fact that the mid upper turret had been removed (or not fitted) in early May 1943. Note that just near the crew entry...
I remember that day well. I was at home when I heard the noise of an aircraft approaching. The sound was unmistakably Merlin engines. I looked up and there she was, approaching me at an altitude I didn't think was permissible in my location. A fabulous site as she went right over my roof and...