Bob Paulson, retire after the season of either 1974 or 1975, an died around about 1980, he did not ride speedway for any other team, and yes you are correct Bob did commit sucide.
Sad to say that John Dews is no longer with us, I think he died of a brain tumour, he went on to ride for Oxford and White City, and I believe that he retire in 1976, he came back to Team Manage Sheffield in 1977, and he did that until 1980. He later went onto Promote at Stoke.