Didn't Wout Steenhuis(spelling may not be right there..) make a number of guitar instrumental recordings with a Bison?
From what I've read and seen in photos, I don't think there were a lot of session players using Burns back in the '60's..
Another couple of Burns players I've just remembered include Eric Haydock and the bass player with Them, who both used Burns Double Six 12 string jobs (with six guitar strings and a six string bass set as doubles) as bass guitars.
The Troggs original version of Love is All Around had both a Burns bass and Burns electric 12 string on it, I think...
Elvis mimed with a 12 string in one of his movies, but that hardly counts, eh?!