Hi Mark
I couldn't Find Thornton Chapman on the 1851 Census..But I was Wondering If You Had Any Of This Information
Birth/BapThornton Chapman
b 01 Aug 1840
c 13 Jan 1841 St Martin In The Field Westminster
John Chapman
Susan Ann
1861 Census
Ter Islington London
Hanson Stuchbery Head 57 Bank Clerk Buckhamshire
Caroline Wife 59 Middlesex
Fanny Dau 26 Middlesex
Maria Dau 21 Middlesex
Thornton Chapman Vistor 21 Tailor London Middlesex
Ann M Kirby Servent
1871 Census3 Groae? Cottages Highgate St Micheal London
Elizabeth Goodwin and Family..
Also at the Address
Thornton Chapman Vistor 31 Occ Clerk London
Marriage 1872
September Qrt Pancras
Thornton Chapman to either Sarah Constable or Alice Warren
Death Thornton Chapman
September Qrt 1877
Age 36
Islington London
Hope this Helps In Some Way
Regards
Iria