Gwylan was very good. He also appeared in a '20 years later' version of University Challenge featuring some of the winning teams now in their forties and did well there too.
Gwylan was on Mastermind, but probably chose too broad based a subject (Shakesperian plays) and didn't do himself justice.
He was however part of a winning team in University Challenge in the early 80's, whilst having a part time job as a mass murderer.
I have appeared in 'They Know It's All...