I was wondering where I knew his face from and i'm pretty sure it's Deal Or No Deal.

There's always one or two familiar faces. These fame hungry desperados seem to apply for everything.

Yes, he was.

He was a really irritating know it all on DOND. Kept on giving advice to players even without being asked, and most of the time the advice was wrong or plain rubbish.

I remember Noel fawning over him in his usual over the top way as if Jack would be the man who would find the cure for cancer in future. He was 'special' according to Noel.

That was said at the end of his game wasn't it. That was very embarrassing. He's just another one of those full on types that force themselves into things without anything to seriously back it up.