A bloke who believes he is the secret love child of Charles, Prince of Wales and the Duchess of Cornwall is so determined to prove his whacky theory that he claims he is taking his case to the Australian High Court.

Simon Charles Dorante-Day from Queensland, Australia, says he was born when the heir to the throne was 18 and Camilla Shand, the woman who was eventually to become Charles's wife, was 19.

He bizarrely claims he was put up for adoption to cover up a potential scandal, despite being laughed out of court multiple times.

Mr Dorante-Day is determined to prove his theory that he, and not Prince William, is the second in line to the throne.

Simon Dorante-Day says he has family photographs that prove his claim

He told New Idea magazine: “My grandmother, who worked for the Queen, told me outright that I was Camilla and Charles’ son many times.

“This is most explosive thing that’s ever happened to the palace,” he continued. “It’s definitely the most significant step I’ve taken so far – I’ve had to force a deadline, hold them to a date, because we need answers.

The Duke and Duchess of Cornwall have no children as a couple

“When I initially filed the papers in Queensland, the court staff laughed at me and bluffed me off."

But he claims he has filed his claim to the High Court as his latest move.

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Mr Dorante-Day believes that the current scandal involving the departure of Prince Harry and his wife Meghan from the royal fold is a deliberate distraction from his own bombshell case: “The government and the palace would’ve learnt about my High Court submissions just before Christmas, and I have no doubt it would’ve caused panic,” he said.

“Then we hear of Harry announcing that he was stepping back from the royal family, all the crisis talks at Sandringham Estate with the Queen, Charles and William. It’s all a very big coincidence!"

Mr Dorante-Day believes the entire Megxit débâcle is a smokescreen to distract from his claim

Mr Dorante-Day believes that he is one of the “other challenges” Prince Harry referred to in his farewell speech.

Simon was born on April 5, 1966, in Gosport, in Hampshire.

When he was 18 months old, he was adopted by a local couple named Karen and David Day.

He claims his adoptive grandparents, Winifred and Ernest Bowlden, both worked for the Queen and Prince Philip in one of their royal households. He further claims Ernest was honoured by Her Majesty.

Mr Dorante-Day's grandparents worked for the royal household

According to Mr Dorante-Day The Duchess of Cornwall, then Camilla Shand, mysteriously disappeared for at least nine months in 1966, and Prince Charles was sent on a tour of Australia at around the same time.

Mr Dorante-Day says that court staff laughed at him when they heard his claim

As part of his apparent lawsuit, Simon has asked for a mediation session and a ‘Statement of Paternity’. “When looking into my options, I received advice that led me to believe that it was best to take my case to the High Court,” he says.

“Charles, Camilla and the Queen have spent years hiding from the truth, running from the truth about me, but no more. We need answers.”

Daily Star Online has approached Clarence House for comment.