Lord Geidt, formerly Sir Christopher Geidt, was ousted from the Royal Household in 2017 after falling foul of the two brothers in his bid to modernise the monarchy.
He had acted as a mentor to Prince William for years - ensuring he spent plenty of time with the late Queen on both official and personal business, giving him the chance to learn the ropes and observe how she got things done.
One source said: “William was furious. He spoke to his grandmother and father. “He felt Christopher had worked to modernise the institution and bring it closer together.
He was concerned about the way it had been handled, and how Christopher had been treated. ”The book, Courtiers: The Hidden Power Behind the Crown by Valentine Low, also revealed that Margaret Thatcher needed a whisky after her weekly audience with the late Queen.Read more on msn.com