hello dave,
i have just been talking to a 95 year old relative who knows penarth and its people like the back of here hand, she say's the only howells family in penarth with any influence and shop owners were james howell they had a shop in penarth and then went on to greater things opening a hugh department store in cardiff, james and his family lived in penarth in marine ave, place, or something like that but was known localy as millionair's row, because thats what they were, hope this helps a little, kali.