I was a 14 year old Boy Scout in 1960 and attended the Jubilee Campout in that year on the Salsbury Plain. After watching the sword movies of the fifties, there I was camped within sight of Stonehenge.
An American!
It was an amazing experiance. I still have the British Army commando knife that I traded a neckerchief slide for.
Think it's worth more than that slide now anyway.
Won a lot of splits games with knife at the campout.
Can't imagine a traffic jam by the circle, but I have read articles about the problems, and can only say,give it a wide berth.

rr