They said: “The relationship is now non-existent. They haven’t spoken since the book came out, and William has no intention of picking up the phone any time soon.”

The insider added that the situation between the brothers is so dire that Prince William, who is the heir to the throne, would not extend an invitation to his brother if it were his Coronation.

“If it was William’s Coronation, Harry wouldn’t be on the list,” they said. “It’s no secret that, personally, he would much rather Harry wasn’t there after everything he has said and done.”

William is said to fear that Harry may stage a “stunt” which could over the celebrations surrounding their father’s big day.

After being asked how the Prince of Wales felt with being portrayed as a “villian” who was obstructing to his father’s wishes, the friend said: “William is strong-minded, determined and unafraid to voice his opinion.”

However, they added that William and the King have “never been closer” and William is “utterly respectful” to the monarchy and the King and will “do what his father wants”.

Speaking last month to GB News, royal author Tom Bower urged William to release a “seasoned and reasonable” statement to put claims, made by Harry, to rest.

Mr Bower said that William is “the right man to make it” and that it “should not be an interview”, but a “statement in a regal manner”.

He added that the statement would “draw a line” under all the attacks laid out by Prince Harry, both in his book and accompanying televised interviews.

This is following latest claims, made by an insider, that Harry is Prince Harry is “frustrated” that his family have, so far, failed to offer an apology to Meghan for the treatment which she received while they still working as senior members of the Royal Family.