BEagle ...
I thought I'd return the favour
I believe that London University Air Squadron in the early 50's was part of 65 (London) Reserve Group ... Headquartered at RAF Hendon. Initially all LUAS (as it was known then) airframes were apparently 'coded' RUL before the roundel with a further single alpha code post the roundel. This arrangement then changed to codes allocated in the range thus L-A to L-Z. So I reckon the six Chipmunks in Line Abreast shown above are highly likely to be from LUAS ... later to become your old stomping ground both as pupil and QFI
As far as I can tell WD292 (L-D) is still air-worthy as G-BCRX, likewise WD286 (L-?) as G-BBND. It would also seem WD285 (L-?) might still be air-worthy in the USA as N48110.
Best regards ...
Coff.