He’s finished a movie based on a true event, not known here but a big deal in England, when there was a cheating scandal on their version of Who Wants to Be a Millionaire. Sheen (who's made a career playing real-life people from Tony Blair to David Frost, British actor Kenneth Williams and soccer coach Brian Clough) plays another real-life personality here, the very popular, long-running host of the show Chris Tarrant, (who was not part of the scandal), and he “recreates” the role for the talk show and he and Norton play a brief, funny version of it. He’s a hoot, but what you’ll love is when the host decides he has to phone a friend. And who the friend is, and their conversation.
By the way, I’ve tracked down a bunch of video of Chris Tarrant, who Sheen plays in the movie, and it will not shock you to learn his performance is spot-on brilliant (which you can tell when host Norton breaks into laughter upon hearing it).
But in case you want to check it out for yourself, here's a montage of the real Chris Tarrant introducing himself to the friends who the contestants have had him phone for assistance.
If you want to jump to them playing the game, it starts around 2:30, though the whole thing is fun. And it gets especially fun when Graham Norton phones a friend...