I'm also looking for the family of a George (Edward) Lewis 1912(?) - 1980. Born somewhere in Wales, probably Glamorgan area, died in Reading, Berkshire. However, he was a GWR railwayman, not an electrician. Research seems to indicate a previous marriage to a Ms. Duerkop, before he married my grandmother.
I also remember pictures of (but not the person) "Granny Morgan", who was some relative I was too young to remember.
Not sure it's your Lewis, however, as there are a few differences. He had a daughter, Ro****y, from his previous marriage.
Best of luck with your search.
David