Sounds as though you don't have the full marriage certificate?
Could this be William & Ann in Scotland earlier than 1911?
1891- 6 West Bank, New Monkland, Lanarkshire
William Campbell, 30, Ireland, brick labouer
wife Ann Campbell, 27, Ireland
daughter Margaret Ann Campbell, 3, Ireland
1901- Hurlls Square Glenboy?, Coatbridge, Lanarkshire
William Campbell, 40, Ireland, general labourer
wife Annie Campbell, 37, Ireland
daughter Margaret Ann Campbell, 13, Ireland
visitor Elizabeth Kelly, 5, Glasgow, scholar
boarder Hugh Ferguson, 50, Ireland