1851 Census ?
If its the right William then
William Coulman 51 Bricklayer, born Stechney, Lincolnshire, England about 1800
Lydia Coulman 28 Bricklayers wife, born Newington, Surrey, England
are living at 20 York Street, Newington
However a few queries with this i.e.
1. Why is it Lydia and not Sarah
2. Would there really be such an age gap
3. The condition as to marriage on the original is unclear and I am not sure what it says
And then going to the 1841 census the nearest is
Wm Coulman 40 bricklayer
Mary Coulman 35
living at Flint Street, Newington and both claiming to be born in county (surrey)