Referring to the second of the two aerial photos on here, I guess we are talking about the low, square building in the lower left corner. That was built in the early 1980s as the New Services Workshop. 595 Building, Buildings in Pyestock were know by their names rather than numbers. The workshop had a couple of long bays and was well kitted out with overhead travelling cranes. Part of it was used by the staff supporting the anechoic chamber but the building never saw a great deal of use otherwise. Again referring to the second photo, there is a tall building to the north. That was the plant store, where all manner of items of plant equipment were stored - valves, pumps, bearings, etc. Because of it's size it was also know as the Palladium or elephant house.