When he reappears in 1871 he is with Mary, however in 1881 she lists herself as Mary Ash which was her maiden name
Mary is listed in the 1881 Census as Mary WILD, not ASH
1881: 75 Mansfield Road, Kentish Town, St PancrasRG11/Piece: 219/ Folio: 45/ Page: 4
Head: Mary WILD 37, widow, Lodging House Keeper, b Totnes Devon
Dau: Mary Alice WILD 14, Scholar, b St Pancras
Dau: Ellen WILD 13, Scholar, b St Pancras
Son: James WILD 10, Scholar, b St Pancras
Dau: Edith WILD 7, Scholar, b St Pancras
Dau: Minnie E WILD 7, Scholar, b St Pancras
Plus 1 boarder and 3 lodgers.
It may not have been James that was married before and therefore not free to marry Mary ASH.
It could be Mary that was not free to marry James!
Cheers
AMBLY