I remember running up against Menwith Hill when I was rtying to find a bit of Roman Road. Being by myself I had had a look at the moor to the west and decided it was too difficult to navigate, so went east to what appeared to be a blank piece of farmland. Only it wasn't. So I stopped in a layby and wrote on my map what it was. And while I was doing so, a jeep came past with some very threatening looking USAF MPs in it, and I got a bit cross. How dare a pair of Americans look at me like that in my own country. (Yorkshiremen of corse would be entitled to). They left me to it, but I absconded anyway. This was long before protests there.