This is your man:
1841 census:
Living in Mitre Street, Lambeth
William Hibbert 30 - Hatter
Hannah Hibbert 30
George Hibbert 5
Alice Hibbert 2
Betsey Hibbert 3 Mo
cant find them in 1851 then George is living with Elizabeths family in 1861 which im sure you have already?
Birth Record for George James Hibbert - 1837
windsor, Berkshire, surrey
vol: 6
pg: 210
I would order birth certificate to be sure but cannot find anyone else by that name born in that area.
cheers
nik