Looking for the marriage of John Byfield to Sarah ?

First known child of this couple is Sarah B(e)yfield, baptised 1792 in March. Also James Byfield, baptised 1794 & George Byfield baptised 1797 both in March.
Sarah died in 1801 and John possible died in 1804. Two of the children, Sarah and James, were married and lived in Wisbech.

Any help would be much appreciated.