Thanks for your reply, and I shall certainly be interested in anything you discover about your great aunt. Freddy Horsfall, who married Isabella Williams was my great uncle (my father's mother's brother) I didn't do an extensive census search for the Williams family, but I thought it most likely that this was Isabella and her mother in the 1911 census
WILLIAMS, SARAH JANE HEAD WIDOW F 54 CHARWOMAN AT SEA
WILLIAMS, CONSTANCE ISABELLA DAUGHTER SINGLE F 23 SHOP ASSISTANT GROCERY HAMPSHIRE PORTSMOUTH
Address 16 VICTORY ROAD PORTSEA Hampshire
WILLIAMS, SARAH JANE HEAD, WIDOW, F 54 CHARWOMAN AT SEA (Isabella's mother)
WILLIAMS, CONSTANCE ISABELLA, DAUGHTER, SINGLE, F 23 SHOP ASSISTANT GROCERY born PORTSMOUTH
When Freddy was discharged from the Royal Marine Artillery in 1941 his address was 38 Wimbourne Road, Southsea. I think he and Isabella remained for some time at that address, as I have a photograph with the address pencilled on the reverse. The photo shows Freddy with a dog. Freddy is sitting in a deck chair by a greenhouse. I'd be grateful for any additional information about Freddy and Isabella which you may come across. Likewise, I shall post any future findings in this thread. I have not yet found any record of Freddy's (or Isabella's) death.