Hello Kitty,
Ah I've no doubt written it down somewhere but sloppy record keeping prevents me finding it. Still, I've found this:
http://www.themodernantiquarian.com/post/38765
which says I read it in the 1950 volume of the Wiltshire Archaeological and Natural History Magazine. No doubt you are miles from this journal, but I'm sure if you contacted the local studies library in Trowbridge they would look it up for you? They're very helpful when I've been in there.

Wiltshire County Council Local Studies Library
Trowbridge Reference Library, Bythesea Road, Trowbridge, Wiltshire BA14 8BS.
Phone 01225 713727 or 713732
Fax 01225 713715
Email [email protected]

good luck with the book!
Rhiannon