Not much help for finding John, but could this be son George in 1841, living in South Witham, Lincs:
George Kelley, 20, Carpenter Ap, Born Lincs
(Seems to fit with him being a Wheelwright in later census)
HO107; Piece 624; Book: 13; Civil Parish: South Witham; County: Lincolnshire; Enumeration District: 4; Folio: 7; Page: 7
http://search.ancestry.co.uk/iexec?h...c=&pid=6671209