
Quiz tells the extraordinary and sensational story of how Charles and Diana Ingram attempted an ‘audacious heist' on the quiz show Who Wants to Be a Millionaire? Major Ingram, his wife Diana and an accomplice, Tecwen Whittock, who was sitting in the audience, were accused of cheating their way to a million pounds on what was, the most popular game show on earth in 2001. The couple stood trial for conspiring by coughing during the recording to signify the correct answers to the multiple choice questions posed to the Major by host, Chris Tarrant.

Major Charles Ingram doesn't even like quizzes... but for his wife Diana, and brother-in-law Adrian, knowing the answer is a way of life. When television producer Paul Smith puts everything on the line to make ITV quiz show and overnight sensation ‘Who Wants to be a Millionaire?' a much-loved pub-quiz hobby turns into outright obsession. As Diana and Adrian's repeated attempts to get into in the hotseat fall short, all eyes turn to an unsuspecting Charles to win the million-pound prize. Meanwhile, the repeated reappearance of middle-class, professional quizzers has not gone unnoticed by the ITV team and Paul makes a vow to stop them by any means necessary.

At last, it is Charles Ingram's turn in the hallowed hotseat. The first night is disastrous. Two lifelines down when the buzzer goes, Diana determines that they need a new strategy. It is only when Tecwen Whittock, a fellow quiz-fanatic and acquaintance of Adrian and Diana, develops a cough in the audience the following night, that Charles' fortunes begin to change. As Charles stumbles and about-turns his way to a million, the production team grow suspicious - is this man a genius or a cheat? Sure enough their suspicions lead them to a damning a pattern of coughs on the studio recording and the Ingrams are arrested.

Persecuted and hounded by the public and press - Charles, Diana and Tecwen head to court. At first it seems the case for the prosecution is a fait accompli, but as the case for the defence gets underway, the jury learn there is far more to the story than they know. Alas, when faced with a fifty fifty question, they return with a verdict of guilty. Paul Smith triumphs over those who sought to hack his life's work, but victory does not taste as sweet as he might have imagined. The Ingrams return to a life in tatters to find that, despite losing everything, their love for one another remains.
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