I think the new hangar is a monstrosity. It's totally spoiled the ambience of the airfield [ yes - airfields do have ambience! ]. Airfields are wide open spaces and ,when sitting in the restaurant at Cosford ,prior to the new hangar's construction ,that feeling was there in abundance. Now the place feels quite dominated by a building of inappropriate design. If such a thing had to be built it should have been placed at the rear of the Museum entrance.
Of course it's important to get as many aircraft as possible under cover but they should be in a building in keeping with it's surroundings.