London —

Britain’s Queen Camilla once fended off the unwanted advances of a man on a train, according to a new book, which reveals that she told the story of how she took off her shoe “and whacked him in the nuts with the heel.”

The anecdote is part of an excerpt from “Power and the Palace” by Valentine Low, a former royal correspondent for Britain’s The Times newspaper, which was published in the Sunday Times on Sunday.

Low was told the story by Guto Harri, who worked as communications director for Boris Johnson during his time as Mayor of London from 2008 to 2016.

Harri recalled how Johnson and Camilla, who was known as the Duchess of Cornwall at the time, had “got on like a house on fire” during a meeting at Clarence House.

“But the serious conversation they had was about h

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