Faldingworth & Barnham
When I visited Faldingworth back in 2001 there was a BAe testing “facility” which was in operation and was the reason for the tight security around the whole site and the escort who would only allow me to photograph certain areas. Most of this can now be seen on Google as it uses parts of the old nuclear storage area and buildings.
At Barnham the old nuclear storage site has been in civilian hands for many years and has total open access. I again last visited in 2001 but you could walk around (even go up the towers if you were feeling brave as they were looking a bit worse for wear) and go into the storage buildings which are now split up into small industrial units inside. Lots of photos on the web link from earlier post if you are interested. You may have been seeing the RAF accommodation and training site at Barnham which is close by, just adjacent to the A134, and which certainly back then was occupied and patrolled by RAF Regt.