Your Help Please!

Need Your Help If You Please! If anyone has any info on the pictures below please contact me at
                             Thank you for your help.
I am looking for a picture of Pilot - P/O William George Bruce RAFVR 159087 from 51 Squadron-I have the whole crew except him. 
Picture 1 above appears to be Sqdn. Leaders, Pilots and Ground Crew but I'm not sure if it is 51 Squadron.
Picture 2 appears to be just Sqdn. Leaders & Pilots but again unsure if it is 51 Squadron.
Picture 3 I have no idea where it came from or who or what it is.
Picture 4 is either MH E or I believe it is MH F. Would be nice to put a crew to the aircraft.