This would appear to be the family later:
1851 - Greenwich Rd, Charlton, Kent
Christopher MITCHELL hear mar 47 labourer (can't quite read the rest of the occupation) b.Camberwell Surrey
Caroline wife 43 b.Camberwell Surrey
Harriett dau 19 b.Camberwell Surrey
John son 16 blacksmith's apprentice b.Camberwell Surrey
Caroline dau 12 b.Greenwich Kent
Matilda dau 2 b.Charlton Kent
HO107/1590 folio 36 page 14
If you do a parent search on the IGI
http://www.familysearch.org - filling in no details other than regions (British Isles) and parents Christopher MITCHELL and Caroline you will get a number of children up which would appear to belong to this family

I haven't spotted them in 1861 yet.
Casalguidi
