Have you seen this, Sarah:
http://www.norfolkpubs.co.uk/norwich...ich/nckia2.htm
I found this marriage on FMP - worth bearing in mind.
Year: 1771
Supplied Surname : SPANTON
Surname : SPANTON
Full First name: Humphrey
Supplied First Name: Hum
Spouse Surname: MARSHALL
Spouse Full First name: Mary
Spouse First Name: Mary
Place: WALSHAM NORTH
County: Nofolk