William & Sarah Vandicom's daughter born in 1846 would be Emma and in 1861 she is showing as born Pimlico. Lots of name variations.
1841 Census - Market Cumberland, St. Pancras, Mdx.
Wm Vandican 30 carman
Sarah Vandican 30
both born in county
William Vandecomb age 46 of Lower Sloane St. buried Feb 18th, 1851
1851 St. Lukes, Chelsea
1851 Census - 67 George St., Chelsea, Mdx
Sarah Vandecomb widow 40
William Vandecomb 12
Emma Vandecomb 4
Ann Vandecomb 7 (there's Ann born 1844 you found Deb to help clinche the family. Think R.P. = Regent's Park)
Mary Rutland 45
(all born Chelsea)
1861 Census has sarah & Emma lodging with the Taylor family at 78 Queens Rd <---?>, Chelsea, Mdx
Sarah Vandicomb widow 52 born St. Pancras charwoman
Emma Vandicomb 16 born Pimlico house servant
Linda