They didn't stay in the Isle of Man for long?
1851 census
Class: HO107; Piece: 2175; Folio: 541; Page: 30
8 Cleveland Avenue, Birkenhead, Cheshire
Newgent, Robert Head M 50 Warehouseman b Ireland
Newgent, Rebecca Wife F 50 b Ireland
Newgent, Alexander Son M 17 Plasterer b Ireland
Newgent, John Son M 15 b Douglas, Isle of Man
Newgent, William Son M 12 Scholar b Douglas, IoM
Newgent, Joseph Son M 9 Scholar b Douglas, IoM
+ 3 lodgers and a servant
So, based in the Isle of Man from 1835 until after 1842?