How about Simon Dee from 1960's TV? Seemed to just disappear from the screen in the 70's.
Rolf Harris
*QI Buzzer goes off and lights flash*
Teen heart throb and all round entertainer Mike Holoway.
Star of 70s SciFi show The Tomorrow People. He was also the drummer in 70s boy band Flintlock. His career highpoint was accompanying Paul Shane on his famous rendition of "You've Lost That Loving Feeling"...
I'm actually going to invite guesses for this one. Appeared in three series of a costume drama and one series of a comedy series as a 'side kick' to the main star. Never to be seen on the tellybox again. My old mate John, known professionally by his middle name and birthplace. I last saw him at a Brighton game.
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