The Beckhams are bracing for the release of a book that threatens to put their marriage under the spotlight all over again.

Investigative journalist Tom Bower told the Mirror that his latest release The House of Beckham: Money, Sex and Power contains startling revelations.

Asked whether it featured any new details about David’s alleged affairs, or any new allegations, he said: “Those who want to know about Beckham’s sex life won’t be disappointed.”

Bower previously spent weeks with direct access to Simon Cowell while researching his book on the music mogul. In it, he revealed how Simon had a fling with fellow X Factor judge Dannii Minogue. But this time Bower says he did not even bother requesting access to his subjects.

He said of his reasoning: “One, I knew they would say no. And secondly they have given thousands of interviews and I knew they wouldn’t answer my questions.” He said the pair spent “two long sessions” with a senior member of his team though, which he described as “amicable”.

The Beckhams have been in the public eye as a couple for decades ( 
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PA)
Despite this, he added: “The Beckhams made sure that quite a lot of people wouldn’t talk to me. But I did find enough people to talk to and got a lot of very interesting revelations. It was a book that surprised me. We think we know everything. But in fact there is an enormous amount we don’t know – which the public will find out.”

Asked whether the book could be damaging for Brand Beckham, Bower said: “It’s an astonishing achievement to have maintained their image despite their ups and downs but whether it’s damaging, the public will decide. What do they really represent? And that’s what the book answers.”

The book, due out in June, was snapped up by HarperCollins. The publisher suggested the book will delve beneath the carefully constructed image of their marriage presented in a recent Netflix documentary, which was produced by the couple. While the show did address claims by Beckham’s assistant Rebecca Loos that she had a four-month affair with him in 2004, critics said it glossed over the details.

Readers will be hoping Rebecca Loos gets a mention in the upcoming book ( 
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Getty Images)
A HarperCollin spokesman said: “Through extensive research, expert sourcing and interviews with insiders, Tom Bower has unearthed a succession of revelations shedding surprising insight into the reality of ‘Brand Beckham’. Exploring the couple’s relationship, the truth about their football and fashion careers, their finances and their new life in Miami, The House of Beckham unravels the extraordinary reality of the business-savvy cultural icons to tell an astonishing story of money, sex and power.”

News of the book about David, 48, and Victoria comes as she prepares to celebrate her 50th birthday on Wednesday. On Tuesday, she shared an emotional Instagram post thanking David and her children Brooklyn, 25, Romeo, 21, Cruz, 19 and Harper, 12, for their “unconditional love and support”.

The Spice Girl declared: “As I get ready to step into 50 (in heels, of course!), I feel so incredibly blessed to have reached this milestone. My ambition was always to empower women and make them feel like the best version of themselves.” She added that she was proud of her career trajectory, from pop star to fashion designer, writing: “I believe that you can be many things. A pop star, a mother, a wife, a designer…

“My passion has always been to dream big, then dream even bigger! Believe in yourself first – everyone else will follow. And if you’re really lucky, you’ll find someone who believes in you even more than you do.” Victoria added: “So, here’s to doing more of what I love with the people I love. I’m so thankful for my family, my friends, and my incredible team! This is the beginning of an exciting new chapter.”