In reply to Captain Solo:
A pal and I were there again in the spring and we asked a friendly local retired-ish shepherd who said we'd be fine parking beside the tennis court (up the glen road a touch and off to the left). This we did, but I don't think there'd be space for more than a couple of cars. The "main road" lacks much sensible parking, so 6-8 cars sounds like it would be difficult unless people can find laybys etc further along and walk back. When we were there we later met another party who had parked away up the glen road, close to one of the higher houses. Got the impression this was probably OK in terms of hassle, but again there wouldn't be space for very many cars and if doing that I'd certainly check things out beforehand.
As Mark says, hydro work is a factor just now - massive long snake of plastic piping alongside the track in the spring, and they've reinforced one of the old bridges to allow trucks etc across. Lovely area - we went over the big Corbett and looped back via the Graham, very nice. The landslip thing is worth seeing.