I can check out the Hostel near Clapham, I think they allow camping there too? There's a "Camping Barn" somewhere in that area too. Not sure about access for Non-Moty Parp people, only trains near there are on the Leeds/Morecambe line and Leeds, Bradford or Lancaster are, I think, the nearest main line stations. I'll have a wander over there, this coming weekend, and take a nosey, if that sounds a good one for a few people. I'm quite happy to sort out a do based on Polar Bear's original idea of Gibraltar Farm in Silverdale. Easy access by car or train and within a few miles of decent facilities.
Windy, what about the farm near Dumfries, the KM Rally camping site? I know they have Pods as well as camping and, back in 2007 I was happy with the site itself. Maybe you could have a look into that and pm me the details, if you don't want to set it up yourself. I'm happy to camp or Hostel any time of the year.