In reply to GrahamD:
> I don't know but I'd be surprised if the NT one allowed overnight parking. May be worth a punt phoning the ODG.
My club had a weekend meet at the Raven Crag hut in January, and as an NT member I parked in the NT car park. From memory I'm almost certain that overnight parking is not allowed even for NT members, but I had no problems (membership card left on dashboard, sticker in window) so it may be tolerated in quieter times. I have a smallish hatchback, not a camper van, though.
The ODG car park is fairly small and they may not be keen on a camper. Personally I'd use the NT campsite for security (they have a barrier) and use of the showers.
Post edited at 10:26