I have my grandfather's RAF Service record - could anyone shed some light on the function of the units he served in, what his role would have been and any photos from the stations he served at?

Apologies for the length of the post

He transferred from the TA in 1942 - Sergeant

His first posting was: 2824 (Defence) Sqn, Biggin Hill (Mar 1942) - Flight Seargeant
He the moved to 4015 Special Flight, Fair Oaks (May 1942), followed by:
No.18 EFTS, Fair Oaks (Oct 1942)
No. 20 (Pilots) Advanced, Kidlington (May 1943)
Central School of Aircraft Recognition , Southport (Aug 1943) - Aircraft Recognition Instructors Course, followed by an instruction course at RAF Regt Depot.
20 (P) AFU South Cerney (Sept 1943)
20 (P) AFU Kidlington ( May 1944)
RAF Hospital Halton (June 1945) , left hospital July 1945.
Discharged KR 652 22(d) on enlistment into regular service (Nov 1946)
2788 Sqn -Renamed 58(R) Sqn (Feb 1947)
RAF Regt Instructors Unit Karsfareet, Egypt (Senior Gunners Course) (Mar-May 1947)
Promotion to Acting Warrant Officer -Paid (Feb 1948)
RAF Stn Deversoir (May 1948)
RAF Stn EL Hamra for return to UK (June 1948)
Discharged on medical grounds (Feb 1949)