Friend of the royals Gyles Brandreth 's new biography offers some revealing stories from behind guarded Palace doors.
He has already dropped a number of bombshells revealing previously unknown stories of the Queen’s life and her final days - like her secret cancer battle.
The new book ‘Elizabeth: An Intimate Portrait’ sheds light on the late monarch and her relationship with the rest of the Firm.
He explains that the late sovereign understood Prince Harry's desire to write his up-coming memoir - and how she did everything in her power to ensure Meghan Markle's happiness.
The 74-year-old's biography, which hits shelves tomorrow, comes out on the same day as Harry and Meghan's new Netflix series. Here's some of the biggest stories so far...
Queen's quiet cancer fight
The Queen was battling a painful cancer before she died, the royal biographer and trusted friend of Prince of Philip claimed.
Despite her death being officially listed as old age, Mr Brandreth said that the monarch had a rare form of bone cancer, myeloma.
He wrote: ”I had heard that the Queen had a form of myeloma — bone marrow cancer — which would explain her tiredness and weight loss and those ‘mobility issues’ we were often told about during the last year or so of her life.
“The most common symptom of myeloma is bone pain, especially in the pelvis and lower back, and multiple myeloma is a disease that often affects the elderly.
“Currently, there is no known cure, but treatment — including medicines to help regulate the immune system and drugs that help prevent the weakening of the bones — can reduce the severity of its symptoms and extend the patient’s survival by months or two to three years.”
Queen told Meghan she could continue acting
The late Queen did "everything she could" to ensure Meghan's happiness and even told her she could continue in her former career.
Harry's grandmother told her she could "carry on being an actress" at their first meeting and was "concerned" for her happiness, the books claims.
Meghan first met the monarch back in the early days of her romance with Prince Harry, when she was still a star in the hit legal TV drama Suits.
However, when she and Harry eventually became engaged, Meghan gave up her acting career and took up royal duties - before she and Harry quit the Firm less than two years later.
Prince Philip 'told Kate: you are not a celebrity'
Prince Philip was "relieved" when Kate Middleton started dating Prince William - and gave her three-word compliment, according to the book.
"When Catherine Middleton came along as a potential bride for his grandson, Prince William, the Duke of Edinburgh was, he told me, ‘relieved to find her such a level-headed girl’," he wrote.
"‘If you believe the attention is for you personally,’ he warned, ‘you’re going to end up in trouble. The attention is for your role, what you do, what you’re supporting.
"It isn’t for you as an individual. You are not a celebrity. You are representing the royal family. That’s all. Don’t look at the camera.
"The Queen never looks at the camera. Never. Look at who you’re talking to'."
Queen 'understood' Harry's desire to write memoir
The Queen 'understood' Harry's desire to write his up-coming memoir, the author says.
She thought that Harry was "huge fun" and truly wished him well when he quit the UK to forge a new life in California with wife Meghan Markle
The book, called Space, is being released early in the New Year and it promises to have "raw, unflinching honesty"
But the late monarch knew Harry wanted to "speak his truth".
Mr Brandreth says: "The Queen, I know, was devoted to her grandson, Harry. She loved him, she thought him 'huge fun', and she truly wished him well in the new life he sought for himself in California.
"Whenever he called his grandmother, he was always put through to Her Majesty immediately.
"She even 'understood' his desire to write his book, not only for the money but because he wanted to tell his story – to speak his truth."
Queen not present at Philip's death
The Queen was 'not there when Philip died' despite refusing to leave his side in the last week of his life.
After Philip retired in 2017, Brandreth wrote that the couple would regularly go weeks without seeing one another.
They kept in touch over the phone as Philip wanted to ‘see out his days in his own way’.
But as his health deteriorated she stayed by his side in the last week of his life, but on April 9 he ‘slipped away so quickly’ that palace staff weren’t able to wake the Queen in time.
One way she dealt with this was turning to watching television, including one of her favourite dramas, the BBC ’s ‘Line of Duty’, the book claimed.
She did dislike what she called the constant ‘mumbling’ on the show and sometimes couldn’t keep up with the plot, but enjoyed it nonetheless.
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