Wow, Rollie, we were in the same field together all those years ago! Did you go to the stones at sunrise?
There was a documentary on the other week about how they have found the original quarry. The stones were set up there exactly as they were later on Salisbury Plain. They believe that the Welsh tribe migrated and took the stones on sledges from near Swansea (IIRC) around the valleys to Salisbury.
Don't know if those of you in the states will be able to watch this but here's the link:
BBC Two - Stonehenge: The Lost Circle Revealed