I don't think this is the same family, Wayne. John and Sarah Fox also appear in 1881 census, with daughter Annie, born in Ogley Hay, living in West Ham. John was a chemical worker by 1881.
John Fox-4436
1871
John Fox, 30, Unm, M, Attendant, Shropshire, Morton
Address Sussex House, Fulham (a private lunatic asylum)
1881
John Fox, 41, Mar, M, Attendant on insane, Staffordshire, Moreton
+ wife Annie, children Arthur, Louisa and Edith
Address 18, Blacks Road, Hammersmith
Margaret