Yes Kenny had the hit in 1974, but just before that it had been the B side to Bay City Rollers All of me loves all of you.
Jimmycooper- midge Ure was the lead singer in Slik who formed in 1975 and had a couple of number ones before disappearing. Midge went on to be in Rich Kids I think then ultravox.
I'm not convinced that Keith Chegwin was in kenny. I don't remember him, althougha google search shows the claim that he was in Kenny. He isn't listed as ever being a member on this Kenny site. http://www.glamgreats.com/The%20Kenny%20Story. html