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