as with you I am unable to find a satisfactory link after 1841 - I`m pretty sure he does not feature in the 1851 census.
Not sure if this is new info - she was 5 years older than him which will assist with tying him up.
Name: William Stone
Spouse: Mary Marsh
Marriage: 22 Dec 1817 - Quarndon, Derbyshire, England
Several of the related family trees are in error tying them into a move to Greenwich but their respective age difference is wrong. Sorry I cant do any better.