David Nash and his team of researchers believe the sarsens come from West Woods, south west of Marlborough, and 25km from the circle. They’ve geochemically matched the site using a chip from Stonehenge that was taken during a restoration project in the 1950s. Two of the fifty remaining stones at Stonehenge don’t match the West Woods site though...
Article on today’s Guardian website.
The research paper can be read here in Science Advances.
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I've just been reading the Guardian article and found it oddly exciting and plausible. There are so many big sarsens still lying around in that area (struck me yet again when walking from Rockley recently).