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Prince Philip had been "heartbroken that the royal family has turned into a soap opera", a friend has claimed.

The late Duke of Edinburgh, who died in April this year, also reportedly regretted that members of his family – including son Prince Andrew and grandson Prince Harry – had given personal interviews.

It comes as the Queen marks what would have been her husband's 100th birthday by planting a rose at Windsor Castle.

Appearing on Good Morning Britain today, Gyles Brandreth was quizzed on the controversy surrounding Meghan and Harry's naming their daughter Lilibet after the Queen.

GMB host Ben Shephard had asked him: "You know him and you were close to the Duke of Edinburgh. What do you think he would have made of all of this?"

Gyles Brandreth spoke about Prince Philip's reaction to the Meghan and Harry drama
(Image: ITV)

Gyles replied: "I know exactly what he would have made of all of this. He was heartbroken, as he said to me, that the royal family has been turned into a soap opera and he regretted that very much indeed. He also regretted members of the royal family giving personal interviews.

"He felt [that] no good ever comes of it. I said to him, 'But you were the first member of the royal family to give an interview on television in the 1950s for the BBC and later to things like Wogan.' But he said, 'That was about what I did, my work, never about me as a person.'

Prince Philip wouldn't have commented on Harry and Meghan naming their daughter Lilibet
(Image: Getty Images)

"He reminded me and said, 'You know, in 1953, you won't remember this, but after the Coronation, the Queen and I went to Australia on a tour. Millions of people came out and cheered the Queen, millions. And if the Queen had thought it was about her, it would have been corrosive.

"But the Queen is the same with one person or a million people. Once you begin to think it's about you, you are in trouble. Don't give interviews about yourself. It's about other people.' And that was his philosophy.

Ben asked: "Do you think he would have been upset about Meghan and Harry using the word Lilibet?"

Gyles responded: "I know what he would have said – 'I try to keep out of these things'. He wouldn't have commented, he wouldn't have known what he'd thought!"

*Good Morning Britain airs weekdays at 6am on ITV