Rhiannon,
[quote="Rhiannon"]I think they found lots of bluestone chippings at stonehenge though (don't quote me on that), proving that they were worked there.

Indeed they did. The interesting thing is that bluestone chippings have been excavated at other nearby sites in lesser quantities. If they had been moved to the Stonehenge area by glaciation (a large area, agreed, as per the area of the sarsen gathering), then you would expect to find a few whole bluestones in the area, or at least lumps of, as you do sarsens. What a coincidence if the number of bluestones moved to the area by the end of the northern glacier matched exactly the numbers required by the builders of Stonehenge.
Makes ye think, eh?
Regards,
TE.