Hi Compo
Although the 1841 census for the Whitstable area is missing, I wouldn't be surprised if your Richard was part of this family found there later

1851
High St, Seasalter, Kent
Richard WILKINSON head mar 58 mariner b.Gravesend Kent
Ann wife mar 58 b.Whitstable
Ann dau 24 b.Whitstable
HO107/1625 folio 486 page 7
...................
1861
Oxford Street, Seasalter, Kent
Amy WILKINSON head (marital status unclear) charwoman b.Whitstable
Amy Ann dau unm 30 general servant b.Whitstable
RG9/524 folio 115 page 12
.....................
There are some baptisms for Seasalter on the IGI (batch number I013499) but only females at present ie. Mary Elizabeth (Richard & Emma) 1820 and Annie (Richard & Annie) 1827
http://www.familysearch.orgNice website there Seaham. I will have a better look later as we have a relative that "migrated" there from Kent too.
Casalguidi
