Thanks for the link Nigel. I note the reference to "hundreds" of people climbing each year. I hadn't appreciated it was so many, I assumed (probably naively) that it was a few dozen. I've never seen anyone up there myself, but I've only ever been there (to Avebury) in the day and not that often. Have I underestimated the scale? Are we talking "mass climbing" in groups, or lots of solitary visits?
[Just curious, rather than going anywhere with this.]