A very well-made documentary piece - thanks, roving!
In 1970 my first ULAS Summer Camp was at RAF Thorney Island. Those who hadn't already completed circuit consolidation would often go to RAF Tangmere for their sessions of circuits and bumps, whilst the rest of us flew GH and aeros over the Isle of Wight. So ULAS Chipmunks must have been some of the last users of this historic airfield; unfortunately as I'd already finished circuit consol., I wasn't able to include RAF Tangmere in my log book as it closed only a few months after we'd returned to White Waltham.
RAF Thorney Island lasted a little longer though; closed in 1976 it was squaddified a few years later.