I can only report much of the same, I am afraid.
Last time I was there, there were some really unpleasant types; cans of Special Brew at 10am, litter all around the stones and shouts and whistles as we wandered round (mind you, I am devastatingly attractive, so no surprise there ;-))
We had also been to Arbor Low the same day and saw the remnants of a campfire and human shit on the henge (complete with toilet paper) Not many things can make me feel that angry.......fuckers
Vx