there is a 72 year old Basil Sewell in household of a Mrs Bateman on Prospect Hill (index Dou 2 page 20) in 1841
Indicated as of indepent means

I believe the Mrs Bateman is the widow of Joseph Bateman (bur Mal 21 Dec 1837) - their daus were bapt at Castletown but C'town reg only gives her 1st name Sarah and no obvious match on IGI for marriage