thanks - I think they use the storage at Greenham Common for computers these days

I am reliably informed that " In reply queries about the 'pads' in the extreme east. They are post-war and built over the former WW2 Bomb Stores of which much of the road system and three Fuzing Point hut bases survive.
The pads in question were 'cargo' transit points where incoming and outgoing munitions were marshalled for loading/unloading onto trains on the adjacent railway spur (disused)."
You can see one of them in use on the following link RAF Welford In Photos - stratojetman
There is further info on the railway elsewhere.