DGC: I remember Channel 4 coming to me and saying, “David, would you like to make a celebrity version of Crystal Maze?” And I said, “Not on your life!” What a terrible idea. We worked very hard to keep an air of mystery around the series and to have integrity and back in 1990 to 1995 you just wouldn’t have done that. Now there would be a celebrity version – but there would also be a massive web presence which we didn’t have.

We didn’t even have merchandise. Can you imagine what it would be like now? Hasbro created a game and there were pub slot machines, and some installations, like one at a bowling alley in Southampton, but really there wasn’t the opportunity for it back then. Also, the complete series has never been released on DVD, and I don’t understand why.

RO’B: I wanted to leave at the end of Series 3, because I was an actor and I didn’t want to become a game show host. And I didn’t want it to drop in viewer figures because, you know, it was old hat, “seen that”. Channel 4 said they were moving it from the evening to 2 or 3 o’clock in the afternoon. I didn’t want to go down that road and find my worth becoming diminished – I didn’t want to not be able to do acting.

I pleaded to leave after three and they said, "Just do one more," and I said "OK." I did four movies shortly after that and I don’t think I would have been allowed to have done them if I’d stayed as a game show host, so it was the right decision for me anyway.

I understood that my life would change after being on television and it did. People would grab me if I was in an airport or something – I mean physically grab me – and say, “Oh! It’s you!”

DGC: I have a framed copy of Broadcast magazine from May 18, 1990, and it’s the week ending May 6, 1990, and guess what’s number one? Crystal Maze, 3.81 million. We were Channel 4’s top-rated entertainment show for six years. It was huge. Personally I think they ended it too soon; but it was their decision.

SC: I live in LA now and I got talking to a young guy in a shop. He said he was going to be an actor. He was from Shropshire and I said I was in The Crystal Maze and he freaked out. They still do. It’s still in people’s minds, if they were 10 or 11 at the time. That’s the power of TV – and I was only on for two or three minutes at a time.