Investigating further...an oddity.
At the 1857 marriage of his daughter, Ann Jones of Vauxhall Road, her father's occupation is given as 'Officer in Excise'.
However, our earliest record has him at Pembroke Gardens, aged 45 and a customs officer (born Flint). In 1851 he remains at Pembroke Gardens, now aged 56 (and a widower). He is now an 'Officer in Customs' (again born in Flint) with a housekeeper, Elizabeth Lodge (Unm, 37, Yorkshire) and a visitor, Elizabeth Brook(?), (Unm, 21, Yorkshire)
The same year, daughter Ann, 25, is a general servant at a pub on 23 Vauxhall Road.
By 1871 (can't find him in 1861), Thomas is at 16 Charnock Road, Vauxhall. Now 66 he is a 'Seaman's Merchant...' (again bon Wales) with....and I can't believe I've not noticed this 'til now...two more daughters!! Sarah A Matthew(?) and Ann J. Campbell. 29 and 27 respectively, and born Liverpool. There's also a servant. This is very odd. They'd be born in 1852 and 1854, and yet Thomas remains a widow from '51 to '71!
Ok, so now there's more leads...but it still all seems very confusing!