Asked how he switches off, William shared: “It is music and film. I love getting immersed in deep-thinking films. I like action films too, but I like something a bit different.
“I’m a big fan of everything Christopher Nolan does. His films are fantastic – The Dark Knight series is psychologically dark and deep, and I absolutely love that.
“He takes concepts that are completely out there and makes them incredibly entertaining.”
The royal, his daughter Princess Charlotte, 11, and son Prince Louis, 8, whom he has with his 44-year-old wife Catherine, Princess of Wales, are huge devotees of BBC’s The Celebrity Traitors.
In the game show, stars secretly “murder” other players, while the latter, known as the Faithfuls, try to identify and banish them from the programme.
William, also dad to Prince George, 13, said: “I love it, the family love it. Charlotte and Louis are obsessed with it. It’s really good telly.”
On October 6, he met 62-year-old Traitors contestant, actor Ross Kemp, in Ilminster, Somerset, where they launched Ready Together, an initiative to help communities prepare for emergencies, such as wildfires and flooding.
Referring to that occasion, the Prince of Wales added: “I saw Ross Kemp the day after the first episode, and I couldn’t help but try – in the most appropriate way – to touch him to see what reaction I got from him.
“Turns out he was really jumpy!”
William joined actors Cate Blanchett, 57, and Hannah Waddingham, 52, and conservationist Robert Irwin, 22, on the sofa to talk about next month’s Earthshot Prize, which all the guests are involved with.
The annual global environment award, which is being held in Mumbai, India, was founded by His Royal Highness in 2020, and it recognises and funds solutions to repair and protect the planet.
William said: “For many years I was hearing stories about environment issues, and one thing that struck me was the negativity and doom, which got me down.
“I thought we could do something more powerful and more optimistic, and the idea of an awards ceremony came about, and we could talk about urgency and optimism together.
“It’s all about getting excited.”
He continued: “There are some amazing people out there doing things to protect the world. We could really highlight what is being done and scale them to the next level to have more impact around the world.”
Completing the episode’s line-up was 29-year-old singer Jorja Smith, who performed Dancing before a chat with 63-year-old Graham.
The Graham Norton Show airs on Friday at 10.40pm on BBC One and BBC iPlayer.