Al R: In the period I referred to a Group Captain commanded a station which, as I said, could have 48 aircraft, plus a few odds and sods in station flight.
AVM commanded a group.
I was thinking about training establishments that might have had more than that, but that was just a guess, I never checked the numbers.
The FTS's seemed to be overrun with aircraft in the early 1950's when the Korean war build up was still in full swing.
N/F squadrons started having Wing Commander c/o's about the mid 1950's; day fighters carried on with Sqn. Ldr's for a while, but I cannot remember when they changed.