In 1851, William and Betsey are already married, living in Fisherton Anger Wiltshire:
1851 HO107/1846 447 15
Fisherton StreetWilliam Green, head, 25, Pork butcher & shop keeper, b. Salisbury
Betsy, wife, 22, b. Winterslow
Sorry, I don't have access to 1841.
Tanja
