http://www.youtube.com/watch?gl=GB&hl=en-GB&v=FvjyYpF1ui8
This is somewhat amateurish (my first attempt at such things) but it will at least indicate my main lines of thought......
Just watched your little film, which you modestly describe as 'somewhat amateurish' and it seems very plausible indeed. I recognise your name and realise that the subject of erratics has been discussed elsewhere with the emminent Avebury/Stonehenge expert Pete Glastonbury. I know he thinks your theory is sound and on matters of archaeology his is an oppinion I respect.
I hope you don't mind me commenting, I have been following the thread and meant to come back to redress the digression that happened re 'blood sports' somewhere in the middle. For what its worth, I think your theory will soon be widely accepted as a strong probability.