At East Knoyle, in Wiltshire, where I lived from 1869 to 1872, there is, or was, in a field at the foot of the chalk downs, a large irregular stone or rock, of which it was said that there was as much below ground as above, and that many horses had been employed in a vain attempt to remove it. A labourer working in the garden of Knoyle House, once told me, "they do say as Old Nick dropped it there, when he was carrying it to build Stonehenge."
Folk-Lore Jottings from the Western Counties
Grey Hubert Skipwith
Folklore, Vol. 5, No. 4. (Dec., 1894), pp. 339-340.
L. V. Grinsell, puts it at ST882312, in
The Legendary History and Folklore of Stonehenge
Folklore, Vol. 87, No. 1. (1976), pp. 5-20.
But is it still there?? Similar stories apply to other lone sarsen stones in Wiltshire. Perhaps the fact this site hasn't been added before suggests its demise.