Royals at Harry Potter film set

The Duke and Duchess of Cambridge and Prince Harry will officially open the new £100 million Warner Bros Studios, where the Harry Potter franchise was produced, today.

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William: 'I haven't told Harry that Harry Potter is fictional'

The Duke and Duchess of Cambridge arrive for their visit to Warner Bros studios in Leavesden Credit: Chris Jackson/PA Wire/Press Association Images

The Duke and Duchess of Cambridge are today visiting the new Warner Bros. Studio in Leavesden, Hertfordshire.

Futuristic vehicles from the Dark Knight Batman trilogy, made by Warner Bros, were the first items on display including the Tumbler - the Batmobile, and his bike the Batpod.

William joked with staff at Warner Bros., saying: "I haven't told Harry that Harry Potter is actually fictional."

The Duke also praised Britain's "capacity to produce brilliant works" in cinema, and said that the country's capacity for talent was not a thing of the past.

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