Mate - there were something like 120 aerodromes with hard surfaces in East Anglia in 1945. Quite a few remain in evidence from the air, although disused.
From your description, I would guess that it's Wethersfield. No longer used for flying (apart from being listed a a gliding site), it is used instead by the Ministry of Defence Police. But it has one of the longest runways in East Anglia!
Nice to know that at least one person looks out of the window of an airliner!