The comedian has filmed eight hour-long episodes of the new format, which "invites viewers to discover if they are in The 1% Club."
Producers Magnum Media explain the format "is the quiz show that everyone of all ages and backgrounds can take part in, because, unlike most quizzes, you don't need to swot up on general knowledge to do well. All you need is logic and common sense.
"In The 1% Club, 100 contestants begin every show - but to make it to the end and win the top prize of up to £100,000, contestants must correctly answer a question only 1% of the country would get right.
"Each contestant starts with £1000 and one free pass, but if they answer incorrectly, they are out and their grand goes into the prize pot. Beginning with questions that 90% of the country got right, based on a sample of answers given by 1000 people across Britain, and building up step by step to puzzlers smaller and smaller percentages answered correctly, each time contestants flunk their answers, the prize money swells.
"As the questions get harder and the contestants numbers dwindle, host Lee breaks the tension with his quick-fire wit, teasing the contestants as their brains do somersaults in the battle to make it to the end of the show and a shot at the prize pot."
Mack recently co-hosted woodworking show The Chop. However the series was taken off air when viewers pointed out the tattoos of one of the contestants appeared to be linked to far right ideologies.
Whilst the quiz show is for ITV, Lee Mack will continue to work for the BBC too. He is set to star in another series of panel show Would I Lie To You?, and has already filmed Series 11 of his sitcom Not Going Out, with two further runs already commissioned.
The 1% Club will form part of ITV's winter schedule, and thus is likely to start in December or January.
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