“How do you regain the trust? I don’t think Harry ever can. But from the conversations I’ve had with the King, I would never say their relationship is irreparable.

“The King’s capacity to forgive his son is undimmed. There are other members of the royal family who are much more weighted against Harry, that’s the problem.”

Although the source added that Harry’s relationship with the King appears “irreparable”, it has also been reported that the King is open to reconciliation with his youngest son.

The King is said to have drawn comfort from spiritual leaders, which has led to “spiritual nourishment”, it has been revealed.

The Mail on Sunday reported: “Faith has always been a part of Charles’s life and something he’s explored, but since becoming King it is playing a more central role.

“That reliance on faith and quiet contemplation has become a comfort and asset to him and helps him cope with the role as he adapts to being King.”