Thankyou very much for the help...
I think that my Mary is recorded as Mary Morville on the IGI..her birth given in Skipton on 17th Dec 1811 and Christening on 2nd Feb, both in Skipton. The Morvelle name is sometimes given as Marvel, Morvel, Morvill etc. his sometimes makes it easy & sometimes harder to track them. I'm "hoping" that Mary's father was Joseph Morvell, my ggg grandfather, which would make her my gg grandfather's sister. This would help explain a few details on my tree.
The Bury registrar had no info on Mary's or Fletcher's fathers or their occupations. I believe their info was coming from the St Mary's parish register. Does this mean that there might be more info on the marriage certificate if I ordered one directly from the Lancs record office?