During the making of Standing with Stones, filming at so many sites in a relatively short period of time, what overwhelmed Rupert and I in the end was the sense of: "what's missing?" It seems to us that visiting stone circles we have been duped into seeing just stones circles and interpreting them merely as stone circles. Roofed or not, I cannot believe that these were spaces of stone alone. If we could see the timber posts, buildings, wattle fences, avenues, crowd control barriers, huts, animal shelters etc., etc., that could well have been equally essential features of these sites, we should have much less trouble interpreting their purpose.
Was the closed ring of the Rollright Stones (or indeed Moel-ty-Uchaf) footing for the timbers of a large enclosed space?
Another idea I love to play with (I couldn't squeeze it into the sequence in the film, though) is the thought that the Recumbent Stone Circles may have been enclosed, the space above the 'altar' stone left clear to observe the passage of the moon? A Neolithic Imax?
Whatever.
Michael.