Roadster, I can only imagine that Dishforth was for JP ops and Topcliffe for Bulldog ops to avoid mixed types in the circuit.
You are correct re the one pristine hangar at Dishforth. All the hangars were scheduled for total refurb around 1983-ish. Only one was completed as the Company doing the refurbs went bust.
The thousands of gallons of metal primer paint stored in four shed went missing shortly afterwards. The number of farmers barns, sheds etc that underwent a miraculous metamorphosis to emerge a lurid lime green was amazing.
As for the photo of Toplcliffe VCR, that brought back many a memory of playing Uckers with Butch Weilding et al on black flag days.