He has lost his subsequent court battles to have it reinstated for him, wife Meghan and their two children and is planning an appeal. According to PEOPLE magazine, Harry believes his dad could help to have this reinstated, although this has been dismissed as “wholly inaccurate” by a palace source.

And now a friend of Harry’s told the magazine: “He gets ‘unavailable right now’. His calls go unanswered. He has tried to reach out about the King’s health, but those calls go unanswered too.”

The birthday wishes come as Harry said: “Bring on the next decade”, as he turns his back on a turbulent period that rocked the Royal Family. Harry said he was ‘excited’ about celebrating his 40th birthday ahead of the big day, and in comments released to the BBC he said fatherhood had given him a renewed sense of purpose to make “this world a better place”.

The past 10 years have been a period of upheaval for Harry and his wife Meghan who, after struggling behind the scenes with royal life, stepped down as working royals and moved to America for financial and personal freedom.

The couple appear content with their lives in the celebrity enclave of Montecito in California where they have established a new life for themselves and their children Archie, five, and Lilibet, three.

Harry told the BBC: “I was anxious about 30, I’m excited about 40. Becoming a father of two incredibly kind and funny kids has given me a fresh perspective on life, as well as sharpening my focus in all my work. Being a dad is one of life’s greatest joys and has only made me more driven and more committed to making this world a better place. Bring on the next decade.”

Harry is expected to celebrate his 40th birthday with family and friends before spending some time away with a group of close pals, according to reports.