Fine hut circle in Enclosure “A”, showing near-complete inner facing of the walls. Image credit: A. Brookes (3.2.2013) thesweetcheat Feb 8, 2013
That's in pretty good nick. Looks an interesting site.
Yep, well worth the visit. It was a drizzly late afternoon (Sunday), and the photos don't do the site justice.
T is right, that is a superb hut circle, very similar to these Canadian Tent Circle things I've been reading about.
It can't be much of a leap from "tent ring" to more permanent circular structure, I guess.