For those trying to help, the information given came from the 1841 census (HO107, 593, 27, 12, 19).
Margaret born out of county; William & Hannah born in county.
Bearing in mind the 1841 age rounding, William was therefore born 1782-1786, and Margaret 1787-1791.
So, this could be them in 1851?
Reference HO107, Piece 2128, Folio 332, Page 32
Carlton, Gedling, Nottinghamshire
Fletcher, William Head M 65 Drover b Hathern, Leicestershire
Fletcher, Margaret Wife F 63 Seamstress b Lighton, Salop (Shropshire)