On Duty with the Queen, an upcoming book revealing Buckingham Palace secrets from a one-time top official — including Prince Charles’ marriage to Princess Diana — has the 65-year-old nobleman “furious” at what he believes to be a betrayal of the highest order.

“This man was a trusted friend,” an insider told the ​Sunday ​Mirror of Dickie Arbiter, the queen’s ex-press secretary of a dozen years. “It is just a case of a man who he thought was a friend and who could be trusted cashing in on the misery of that time.

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“It is disloyal.”

Arbiter’s tome, set to hit shelves in two months, teases it will present an accurate account of “the most turbulent [timeframe] in the history of the modern British monarchy,” and “candid look behind-the-scenes of the most sensational and ­salacious royal stories.”

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“This is not just a memoir of an intense dozen years but is a story of a life, my life and it’s been quite an ­extraordinary one,” Arbiter, 73, said of the book, adding that it will “delve into the dark days” of Diana prior to her tragic death in the summer of 1997.

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