I am looking for any information on the whereabouts of my uncle. He was born John William Glew to Frederick and Edith Glew (nee Lapworth). I believe he was born in Surrey, England but I am not 100% sure. He was one of 5 children (I have since found out there are 2 more) and was adopted formally by his mother's second husband David Dalton in approx late 1950's (?). He was last seen in the London in the mid 1970s but I know he had ties to Wales.
I am desperately trying to find him as he is the last of my mother's siblings to be tracked down. Any information would be gratefully accepted.