In Higham Ferrers we have;
1841 Census
James Nutt, 26, not born in County
Hannah Nutt, 26
Mary Nutt, 65
1851 Census
William Nutt, 50, Head, Widr, Ag Lab, born Fleet. Lincolnshire*****
Mary Nutt 75, Mother, Widow, born Ringstead, Northamptonshire
John Nutt 26, Son, Unm, Ag Lab
Hannah Nutt, 17, Daug, Unm
So fits with Baptism in Gedney Hill for William, Mother Mary is buried 6 April age 75
Census was taken 30 March
So Marriage looks correct Rosie found
John seems to be Baptised 1777 to WILLIAM/SARAH in Higham
Possible of FreeREG for Mary Barwick also 1778 Ringstead
(they has another Mary 1776 who was buried a few days later)