I have also looked at baptisms for children of a William and an Elizabeth (but may not help at all if you say they had children elsewhere): 9 Oct 1827AnnWilliam and ElizabethFathers Occ-Farmer 4 Nov 1829Susanna
Then some from 1850 with Father's occupation as a Farmer but then some with Father's occupation as a Butcher!
Also found a William Pinder marrying an Elizabeth Frith in 1826 so this may account for the above children (or some of them!)and not your William and Elizabeth. Just thought I would see. Michelle