Hello Lesley,
I have a marriage extract for a wedding in 1784, I think, between William Cannell and Ann Killey, where one of the witnesses was Wm. Gell. My grandparents were later to inherit a farm known as Shaughlaigue (spelling?) in Micnael. I don't think the Braddan William is my gg grandfather, he and presumably another Ann Killey married in Santon in 1784.
Peter Cannell