Princess Diana 'smacked' Prince Harry after his 'casual racism' towards a bus conductor, a new book claims.
The mortified Princess of Wales allegedly abandoned a trip out with both her sons because Harry had been repeatedly mimicking the Sikh bus conductor's accent.
The shocking revelation comes in Robert Jobson's new book, 'Our King', with the royal correspondent revealing behind-the-scenes details about the Royal Family.
Princes William and Harry had been enjoying a fun day out with their mother, which had been organised by her police protection officer, Inspector Ken Wharfe.
The boys were taken for a ride on a London bus as a treat, where it's claimed eight-year-old Harry 'embarrassed' his mother.
In an extract of his new book, Jobson writes: "On the bus, Diana had to tell Harry to stop mimicking the Sikh bus conductor's pronounced Punjabi accent every time a passenger pressed the bell to get off.
"The conductor, a jovial chap wearing a bright-yellow turban, was relaxed about Harry’s casual racism, but Diana was mortified. The princess was so embarrassed that she eventually told Ken Wharfe to abandon the trip.
"Diana, Ken, William and Harry all got off at Green Park and Diana immediately smacked Harry and told him, 'Don't you ever do that again.' She was so incensed that she even made Harry write to Inspector Wharfe to apologise for his behaviour and for spoiling the day he had arranged for the boys."
Jobson says that he had spoken to Wharfe, who confirmed the incident did take place, as well as seeing the letter which Prince Harry sent to apologise.
Stating that Diana's former police protection officer still has the letter in his possession, Jobson claims the young Prince "joked" about the phrase he used.
"As he was still a child, I suppose Harry can be forgiven, but it demonstrates clearly that Diana would not tolerate any form of racism from her two sons," he adds.
Harry has spoken a lot about his own 'unconscious bias' in recent years - and spoke about the difference it has to racism during his interview with ITV's Tom Bradby at the start of the year.
"The difference between racism and unconscious bias, the two things are different," he explained.
"But once it's been acknowledged, or pointed out to you as an individual, or as an institution, that you have unconscious bias, you therefore have an opportunity to learn and grow from that in order so that you are part of the solution rather than part of the problem.
"Otherwise unconscious bias then moves into the category of racism."
He also claimed he did not label his family racist after previously telling the world a senior royal questioned the colour of his unborn son’s skin.
Harry and wife Meghan sent shockwaves through the British monarchy when they spoke of their disgust at "concerns and conversations about how dark his skin might be when he's born".
In the wake of the bombshell, the late Queen released an unprecedented statement via Buckingham Palace saying: "Recollections may vary", while Prince William when confronted sternly said: "We are very much not a racist family".
During the ITV interview, host Bradby said to Harry: "In the Oprah interview you accused members of your family of racism", the Duke snapped back: saying "no I didn't", adding "the British press said that".
In a further snipe at his family, Harry denied he'd "describe that as essentially racist", replying: "I wouldn’t, not having lived within that family."
But he refused to name the individual concerned, having previously denied it was the late Queen or Prince Philip.
Harry also backed the late Queen’s former aide Lady Susan Hussey, after she was embroiled in a race row last year, saying "we think she’s great"..
OUR KING Charles III: the Man and the Monarch by Robert Jobson goes on sale on April 13.
