Hi Brian,
Thank you ever so much for looking for me. Gwenllian had a daughter Margaret whose married name was Roache, but her age would have been 38 rather than 33. It looks like it is the right one and that Margaret's age has been mis-transcribed. Although I don't know who the other person Margaret Ann Folken is. I have looked at the BMD and can not even find a death registered for a Margaret Ann Folken in 1908, perhaps her last name has been mis-transcribed, but will hopefully find out who this person is at some point.
Thanks again, I appreciate what you have done for me very much.
Best wishes
Lainey