I guess the best known is Millionaire. We've done all sorts of stuff: Winning Lines. The Lottery. The People Versus. And we do The Weakest Link all around the world but not in England strangely enough.

How did you get into all this?

Oh, wrong place at the wrong time. Somebody wanted to do a game show. Did one, then two more, and then I was just doing so many that I gave up the other stuff I was doing and concentrated on game shows.

What appeals to you about game shows?

I came from a kind of computer background. I did some weird engineering thing and then got into computers and then into television. It's technology but you're not stuck in front of a screen. You're in a nice environment.

How does the system work on a program like Grand Slam?

It's not that different from other quiz shows except that the time is so critical. It runs pretty much on its own. It generates all the questions. It generates the question strap on screen for the audience. It generates two clock displays. It displays the screens to the competitors so they can see the questions or not see the questions. It generates a feed to the question setter and generates a feed to the commentators. So it's all running automatically. The judge has a box with yes and no buttons. And so when they hit 'yes' it pulls the next question up from a database and fires it off to the relevant places.

Are there any particular challenges thrown up by Grand Slam?

Well it's so time critical. We've just upgraded our machines to make sure they're the fastest. And because people are paying £1000 suddenly instead of 'oh yeah fine, I'll give that question', it's well if you don't get this right you've lost your thousand pounds haven't you? There's only one person who's going to win the prize. So there's pressure there.

What's been the most challenging show you've worked on?

They're all challenging. That's what I like about it. All the shows have something in them. Millionaire had its problems. People Versus had a lot of animations. It wasn't a particularly successful show but it had some great graphics. Recently we've done this TV Scrabble game on Challenge TV where we modelled this 3-D board. When they cut to another camera, it re-renders the board from the new camera's viewpoint. It works bloody well. Very sexy.

You must have seen many questions in your 20 years. Are you any good at quizzes?

I'm not bad. I sometimes think maybe I should enter. But I don't actively quiz now.

Have any contestants stuck in your mind?

There's a contestant mafia around. There's loads of people you see again and again in different game shows. Some of them are very driven. Most of them are on Grand Slam actually.