Looking for info on following airmen, killed on active service:

Sgt Bernard A. HARTLEY - 901037, and
Cpl Charles E.H. STRUDWICK - 847118,
death of both registered Northumberland South.

Sgt (Pilot) Kenneth W. JOYNER - 1551622, death registered Cirencester, Gloucestershire.
(May have been with 52 OTU and involved in an accident with a Spitfire forcelanding at Elkstone near Birdlip, Gloucestershire).

Can't find any matching aircraft serial for above mentioned airmen.

Regards and thanks for your help.
Henk.