One of the best visual IPs near Dunkeswell was the 'Government Radio Station' at Trickey Warren, which was an outstation of the 'Composite Signals Organisation' at the old RAF Culmhead.
A bright white building which could be seen for miles even at low level and it was also radar significant. Plus we knew that the spooks would never complain about the noise of 90 tons of tin triangle flying overhead at 300 ft / 350 KIAS as they wanted to keep their sneaky-beaky activities schtum....
If you dig out that old movie 'Strategic Air Command' which features James Stewart flying the B-36 and B-47, there's a piece in the film showing an RBSU in operation - of course Jimmy Stewart's crew score a 'shack' (DH)!