I keeep planning on trying to find somewhere but my time is so limited it is just another project on the list!
we will find somewhere, you just need to turn up.
Red Lion, Avebury. The brave ones could walk up the Ridgeway and hide overnight?!?!
Just camp, I would query the private ownership which is in doubt but even these people say you can.
http://www.nationaltrail.co.uk/ridgeway/faq.asp?PageId=7&p=2