In reply to Iain Peters: Not an official reply, but certainly last summer you could camp at the count house and I don't think anythings changed.
Thanks to all the replys above. The reason I wanted that specific site is that we're thinking of using it as a base for a Scouts sea cliff climbing trip - the other sites are possibly too small or wouldn't suit a large group, as far as I'm aware. But we wouldn't want to take a chance on just turning up, so if anyone does have the contact details for the farm, though it's a long shot, I'd be very grateful.
Thanks again.