My William is indeed the one who married Mary Fay at Manchester Cathedral - this is the only place the Fay spelling is used - every other record shows it as Feay from ca 1790 up to the present descendents of male lines.
So it looks like your William and mine are from different lines. My Wm. was the son of Joseph b. ca 1799, Lancashire, and Ann ??who d. ca 1828. I have found nothing further on Joseph and Ann, except that Joseph m. 2) Ellen Clare.
Sorry I can't be of more help. I would like to add more to my Hibbert line - it is my maiden name.