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I was actually asked to go on the pilot episode. I received a phone call from one of the producers whilst I was getting out of my car in a retail park. She had found my contact details online, and described the show to me. I was in a hurry, and thought it sounded completely stupid. I had to travel to London and stand still for 10-15 minutes trying to keep a straight face. I thought surely someone a bit closer to London could do that, so I politely declined.
Turns out there was.