The oldest inhabitant told me that about 65 years ago, on a Palm Sunday, some fellows got the large stone on top of Cley Hill, which had a socket (meant, my friend thought, for a flag-staff--? a cross), and rolled it down either to the lime-kiln or another side.
From Wiltshire Notes and Queries, June 1898, p486.
wiltshire.gov.uk/community/gettextimage.php?book_no=002&chapter_no=11&page_no=0043&dir=next