There is a burial 19 Sep 1847 at St Mary, Paddington Green: John Headland age 82, abode Little North Street, St Marylebone.
London Burials
And Anne is at 31 Little North Street in 1851, widow, age 75, House Keeper, born Hants Hartley Wintney.
1851 census
John's birth should be around 1765 if his age at death is accurate. Shame we don't have a place of birth for him!