Prince Harry’s tell-all autobiography Spare was set to be released on January 10th, but copies of the book were on sale in Spain yesterday.

He allegedly made a series of sensational claims against high-ranking family members including King Charles, Prince William and Princess Diana.

Chris Ship, ITV News Royal Editor told Newstalk Breakfast that the book is full of questionable offerings.

In the book, Harry talks about experiences such as doing cocaine, losing his virginity and putting the blame on William and Kate for his wearing of a Nazi uniform in his youth.

Harry also claims that he and William told his father not to marry Camilla before their 2005 wedding.

"Because this book went on sale accidentally in Spain", Mr Ship said, "news organizations suddenly got on the phone to their Spanish translators and had all sorts of bits of the book translated".

"I think we've now pretty much got everything. "

Sharing some tidbits, such as his killing of 25 members of the Taliban, has been deemed 'unwise'.

"I think it's one thing to say, 'look, I went to Afghanistan and I did end up having to shoot people. That was the task assigned to me by the British government", Mr Ship said.

"But to have a tally, to have a number... I think a lot of people who have served in the military and did serve in Afghanistan... question the wisdom of that."

A senior Taliban leader has since responded to the comments, saying that the militants he killed in Afghanistan were "not chess pieces, they were humans".

Reputational damage

Whether the book will damage the reputations of members of the royal family or rock the institution is yet to be seen.

"I think if your supporters of Harry Meghan, you'll probably think he has been mistreated", Mr Ship predicts.

"However, I think if you support the royal family, you may think this is not the way to go about things."

In that case, he said, "it's going to move the dial very much".

"There is a danger I think that Prince Harry is kind of oversharing now and people might feel like they've heard too much and that has the potential to backfire on him."

Listen back to the full conversation here.

Main image shows William Prince of Wales and Catherine Princess of Wales accompanied by Harry, Duke of Sussex and Meghan Duchess of Sussex. Picture by: Jamie Lorriman / Alamy