The person I mentioned who has a tree on ancestry kindly gave me info from the 1991 England census.
It has Edward William Welsh as a boarder in a house with Caroline R Hobart as the head, address 123 Rawson Road, Seaforth, Lancashire.
Antoniette is not listed, but he has 3 daughters with him - Edith aged 20, Hilda (Florence) aged 15 and Doris Ida aged 6, all born in Liverpool.
Antoniette has disappeared and I can find no more on the fate of Edward.
Thanks everyone,
Phil