Quiz writer James Graham: I have my own doubts about the Coughing Major's guilt

Speaking exclusively to RadioTimes.com, he said: "I don't judge the jury for making the decision that they did, they were presented with the evidence they were presented with, and they came to a decision [of a guilty verdict], and that currently is the decision. And the Ingrams still maintain their innocence, and the producers and the police maintain that they are guilty.

"But certainly having been presented with new evidence, I have my own doubts about the clarity of that narrative."

Graham, who has adapted his play of the same name into an ITV drama starring Matthew Macfadyen and Sian Clifford, hopes that TV audiences will rethink their preconceptions about the real-life case after watching the show.

"There were so many things that I found extraordinary about the case that don't make sense," he said. "The Ingrams and Tecwen Whittock [their alleged accomplice, whose coughs supposedly alerted the Major to the right answers], had never spent any time in a room with each other, and only had one phone call that lasted eight minutes, as fans of the show who discovered they were going be on the same programme together.

"The fact that he [Whittock] has a diagnosed cough, he has an asthmatic condition that he can't control. Would you pick someone who has an uncontrollable cough to cough at specific moments, during a really tense game show? Maybe you wouldn't."

Many viewers' knowledge of the case will have been gleaned from watching YouTube videos that appear to show the moments that Whittock's coughs coincide with the correct answers being read aloud.

"If you watch the episode now, from previous documentaries or online, you can hear the coughs and they're really loud," Graham said. "I hadn't realised that those coughs had been amplified by the prosecution to replicate the experience of what they thought it must have been like to be Charles on the show, listening out for the coughs.

"But actually what we're listening to has been by definition manipulated, and that was the evidence that was presented to the jury - so there's lots of things that are worth questioning."

He concluded:" At the heart of this story were real people who I think were completely unfairly villainised and mocked, and to readdress that is really exciting".

Quiz starts on Sunday May 31 at 10/9c on AMC