Fox, 35, stars as Guy Haines in the play, a stage adaptation of Patricia Highsmith’s novel, also made into a 1951 film directed by Alfred Hitchcock.

Fox said the role of Guy, an ordinary man pulled into an extraordinary chain of events, was his favourite kind of part. “It’s like Morecambe and Wise. You need the guy the drama happens to,” he said.

“Given the choice, I would always prefer to play the guy who is a real person. I like the Everyman part. The hardest thing to understand is what a normal person would do in an extraordinary situation.”

But the actor, who was supported in the audience by his Lewis co-star Kevin Whately, insisted that his wife was the true thespian in their marriage. “She’s a much better actor than I am. I’m really pleased at that,” he said. “It would be awful to go out with an actress who wasn’t better than you. I love her for that. And she will always have my back.”

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