Not sure if any of this will be of much use, but the National Trust actually have a whole set of Byelaws of their own, confirmed with the Secretary of State in 1965. These include sections on ‘camping’ and ‘public gatherings’. For more details see…..
http://www.nationaltrust.org.uk/main/nationaltrust/byelaws.htm
I also have to add that Avebury is one of the ancient sites handed to the National Trust by English Heritage in 1994. I believe that while the National Trust are responsible for looking after the sites, the guardianship and overall responsibility is retained by English Heritage.
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