Visited today. Some one has decided to 'improve' the site by placing an upright stone in the centre. Considering the time and effort needed to reach it, its incredibly depressing to find it vandalized.
Unfortunately I'm not familiar enough with the site to have been sure that it had been altered till I was able to check photos here, so didn't feel confident to move stuff.
Can't be sure but did look like one of the orthostats. (sadface)