Hello, Epo,
1841 census
HO107/1061  book 5  folio 31  page 10
HARLINGTON St., St. Mary, Lambeth
David Davall  age 15  Bookbinder's app.  born in county Yes
Thomas Roden  age 15   ditto  b in c No.
 These two were shown together with the following in probably the same premises.
William Gregory  age 40 Ostler  b in c Yes
Mary  age 35   b in c Yes.
Note, it is Harlington not Hartington
Hope this helps,
Meliora