http://www.dailymail.co.uk/sciencetech/article-1290843/Archaeologists-begin-dig-buried-stone-circle-TEN-times-bigger-Stonehenge.html

It was last looked at 41 years ago apparently. The findings should shed a bit more light on things. One thing is obvious...this part of Wiltshire was a massive centre for whatever was going on when you combine it with Avebury, Stonehenge, and Durrington. More reason to wonder why we still know so little about something so wonderous and important to the people of its time!