What's next - the Hogwarts Express?

The Hogwarts Express leaves from Platform 9 3/4 in the Harry Potter books. Credit: Clarence House.

After the royal couple's trip on the Metropolitan Line, Clarence House tweeted this picture of the Duchess of Cornwall at "Platform 9 3/4" at King's Cross station.

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Charles & Camilla on the tube

The Prince of Wales and the Duchess of Cornwall hopped on the tube today to mark the underground's 150th birthday.