Staffordshire physics teacher David Edwards hatched a meticulous plan when he entered Who Wants To Be A Millionaire in 2001.
Not only did the then 54 year old want to get into the chair, but he wanted to make sure he walked away with enough cash to retire.
As a Mensa Superbrain and past Mastermind winner, David knew he was in with a chance if he could just get onto the show and past the tricky Fastest Finger First selection round.
And to do that, his first step was to cleverly calculate how many times he would need to call to get a place, devoting £1,000 to his cause.
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