I just found my maternal grandmother ( and my mum ) Turns out I am a part Somerset lad
My nan always said she came from Burmondsey ( indeed that is where other members of her family lived ) and I suspect she never new from whence she came.. Her family must have moved to London when she was very young.. I remember she took me 'up town' once and pointed out what looked like a boarded up hole in the wall of the approach to London Bridge.
Turned out it was one of a small row of shops that used to be there.. She was employed as a milliner there