I think I'm pretty safe in assuming it's the Jack Welsby of previous GWR record-holding tube fame (to quote my fiancée: "he seems gimpy enough"
I know there was a team of you on Eggheads and I've also noticed this thread from 2006.
I myself was on University Challenge in 2001 representing Sheffield Hallam, the first and, to date, only time that particular establishment has made it onto the programme.
Any other connections? Declare them here. No wonder you make a kick-ass quiz team.