Hi Susan
You mention the marriage of John to a Susannah, there is a baptism on the IGI for a William son of John & Susannah 17th June 1781 in Hexton. Any good to you.
I wondered if you noticed the Outrelief Application on HALS index for Hannah Wiggins 2nd July 1836, place Hexton & the index name is Hitchin Union workhouse, her age is 69. Could she be your Hannah, age corresponds with 84 at death but not with 25 at her marriage.

Maddie