Harry's book "Spare",  which went on sale in Spain on Thursday five days before its official release, chronicles not only hugely personal details, such as how he lost his virginity and took drugs, but also discloses more intimate private instances of family disharmony.

His elder brother, heir to the throne Prince William, knocked him over in a brawl, and both siblings begged their father King Charles not to marry his second wife, Camilla, now the Queen Consort, the book says.

Commentators say it has plunged the monarchy into its biggest crisis since the days of the royal soap opera in the 1990s around the break-up of Charles' marriage to his late first wife Princess Diana, William and Harry's mother.

All this comes just four months after Queen Elizabeth died and Charles acceded to the throne.

"So here's Charles trying to establish himself as the new king and now Harry's thrown this hand grenade and it's all coming kind of crashing around him," royal biographer Tina Brown said.

Since Harry and Meghan left royal duties and moved to California in 2020, they have railed at their treatment by the royals and the palace institution.

From their interview with Oprah Winfrey in 2021 to their six-part Netflix documentary series last month and now Harry’s book, the couple's message has been the same: that the royals and their aides not only failed to protect them from a hostile and sometimes racist press, but actively leaked negative stories about them.

So far, there has been no comment from Buckingham Palace or anyone who speaks for the royal family, a stance that has been lauded by much of the British media as a dignified silence.

No point in 'staying silent' 

On Sunday, Harry's public thoughts will keep coming, with three more TV interviews due to air. They had been timed for broadcast ahead of the official launch of Harry's book on Tuesday, and excerpts released ahead of time have shown Harry saying he wanted to give his side of the story.

"I don't know how staying silent is ever going to make things better," Harry says in his interview with Britain's ITV, which will be the first to be shown.

Polls suggest many Britons are becoming bored of the whole royal melodrama, and further revelations are unlikely to shake their views, whether sympathy for Harry and Meghan, or for those they criticise. However Harry's book was No. 1 on Amazon UK's bestselling books list on Saturday, available for pre-order ahead of its release.

Royal commentator Emily Andrews said that given Britain's current cost of living crisis, there could be limited support for the complaints of a privileged prince residing in a mansion in California.

"They are polarising, Harry and Megan, and I think that this new book by Harry probably won't change many people's opinions," Andrews told Reuters.

"I think this is overkill, it becomes saturation point and people think 'I don't want to hear anymore: shut up, go away'."

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