Taking the example of Stonehenge or Avebury, land around the henges has to come under special protection, such as SSI, it has to revert back to natural cover, and the archaeology as such has to be explained to the general public. Cope's map of the Neolithic environment of the Ure/Swale Plateau has to be married to Hardings archaeological findings. The Guardian's article referring to it as something like the Natzca Inca lines is a good parallel, it has to be interpreted and then, to quote; "all the magic of modern, sustainable, landscape-respecting tourism will be deployed here." The Stonehenge/Avebury landscapes got there, (not mentioning roads here) so perhaps Thornborough can also retrieve its magic divorced from hedgerows and large gravel holes........