I was issued with my Norwegian winter gear on Friday so I'd be as warm as toast but I can see where Davids coming from, I wouldn't want to stray too far from the path in the Upper Pennines during wintertime...at least, not without a guide.
Nature can get a little too wild up there. It's probably the closest you can get to a true wilderness in England with nothing between you and the Scottish lowlands except a lot of hills, bogs, a few sheep and the odd squaddie.