Royal row reaches a head as Harry and Meghan speak to Oprah

Britain's royal family on Sunday braced for further revelations from Prince Harry and his American wife, Meghan, as a week of transatlantic claim and counter-claim reaches a climax with the broadcast of their interview with Oprah Winfrey.

The two-hour interview with the US TV queen is the biggest royal tell-all since Harry's mother princess Diana detailed her crumbling marriage to his father Prince Charles in 1995.

Diana's admission of an affair with former cavalry officer James Hewitt and her complaint that "there were three of us in this marriage" - after Charles earlier admitted being unfaithful in a separate interview - was watched by more than 22 million people in Britain. 

But that could be eclipsed by Harry and Meghan's tell-all with Winfrey, who has reportedly sold it to US broadcaster CBS for $7-9 million (£5.1 million to £6.5 million, 5.9 million to 7.6 million euros).

Winfrey also retains the international rights, which will feed an appetite of interest about Britain's centuries-old monarchy - and their troubles - across the globe.

"Tin hats on," one royal aide was quoted as telling the Sunday Times, after a drip feed of excerpts in which Meghan Markle complained about the strictures of royal life from her gated Californian mansion.

Viewers will tune in to see if she and Harry have scores to settle with Buckingham Palace since leaving the royal frontline - and if so, how far will they go?

Smear campaign?

Close attention will be paid to any suggestion by Meghan, who is mixed race, that racism played a part in their shock decision to move to North America.

The former television actress, 39, has been portrayed in some British newspapers as headstrong, calculating and spoiled, and the couple reckless and selfish for quitting royal life.

But in her defense, Meghan's supporters, particularly in the US, have seen hints of racism, claiming the monarchy could not deal with a "strong black woman."

In one excerpt, Meghan, who is pregnant with the couple's second child, accused the royals of orchestrating a calculated smear campaign and "perpetuating falsehoods" about them.

That came hours after revelations she was facing an internal palace investigation into claims that she bullied royal household staff after she and Harry married in a fairytale wedding in 2018.

Further reports the couple are facing a probe into their charitable foundation have been seen as a counter-offensive by the embattled royals in a bitter battle for public support and sympathy.

 'Dedication to duty' 

Just hours before the broadcast, Harry's grandmother, Queen Elizabeth II, and other senior royals, including his father and older brother William, made their own TV appearance.

The Commonwealth Day celebration normally passes with little fanfare in Britain, but this year was watched closely for signs of implied criticism of Harry and Meghan.

In a televised pre-recorded speech, the queen spoke of the importance of "dedication to duty," after issues of duty and service became a point of contention when Harry and Meghan permanently stepped back from their roles as senior royals.

"Whilst experiences of the last year have been different across the commonwealth, stirring examples of courage, commitment and selfless dedication to duty have been demonstrated in every commonwealth nation and territory," she said.

Last month, when Buckingham Palace confirmed the couple would not return to their senior roles, it said they would not "continue with the responsibilities and duties that come with a life of public service."  

Excerpts released Saturday showed William and his wife Kate - with whom Harry and Meghan have reportedly fallen out -- praising global health workers for their work during the coronavirus pandemic.

That is likely to fuel unfavorable comparisons with Harry and Meghan, who have been criticized by some media for complaining about their life, even after signing lucrative deals in the last year.

The couple, known formally as the Duke and Duchess of Sussex, are likely to get more public sympathy - and a greater profile - in the US.

'Come out swinging' 

The Sunday Times said the queen, 94, would not watch the interview, which is due to air in full on Sunday night in the United States and Monday night in Britain.

The weekly quoted unnamed courtiers as calling the situation a "circus," and the palace would "come out swinging" if individuals are attacked.

Viewers will also watch to see if Harry sheds light on his rift with William, after reports he and his wife Kate were lukewarm towards Meghan.

The couple is also likely to expand on their attitudes to the media, which they said prompted their departure and against whom they have launched a slew of legal claims.

"We all know what the British press can be like, and it was destroying my mental health," Harry told "The Late Late Show" host James Corden a week ago.

"I was, like, this is toxic. So I did what any husband and what any father would do. I need to get my family out of here."