A Queensland man who claims to be the secret love child of Prince Charles and Duchess Camilla has revealed he received a ground-breaking apology from UK authorities.

Simon Dorante-Day says he received the formal letter in 2014, from the Metropolitan Police.

He was sensationally blocked from entering the UK back in 2012, claiming he was preparing to fly to England to investigate his royal paternity claims when he and his wife were placed on a “no travel list”.

The 55-year-old was blocked despite being a citizen in Britain and his wife not even owning a passport.

Dorante-Day told that the move was made in an attempt to stop his investigation.

“I first went public with my belief that Charles and Camilla are my parents in 2005,” he said.

“I wrote a letter to the Paget Inquiry, set up (in 2004) to investigate Diana’s death, outlining all my evidence – which came about after more than a decade of solid research.

“They took my claims seriously and I believe Prince Charles was interviewed as a result.

“Since then, a lot of strange things have happened to me and my family – one of them, was that my wife Elvianna and I were blocked from the UK.”

The Australian-British man says it was done in a bid to silence his claims.

“There’s a lot at stake if this comes out,” he said.

“And how much is the UK government silencing the royal family or controlling what happens here? That’s my main question.

“I don’t think the royal family can control this alone, and I think to a certain degree the government is still under the thumb of the royal family. What they can or can’t say – the lines of succession.”

Dorante-Day released the letter, saying it’s important people read the apology he received.

The formal letter from the Metropolitan Police’s Directorate of Professional Standards told him that he and his wife had been removed from the notification list “mentioned in your letter of complaint”.

“There are a lot of people out there who think my claims are based just on photo similarities or the words of my grandmother,” Dorante-Day said.

“But there is so much that has happened in the background, a lot of communication with authorities in the UK and legal battles that people don’t know. I’ve researched this for decades, and every road has lead me back to Charles and Camilla.

“So I want people to read this letter and see that my claims were so serious, it even led to UK authorities banning me from the UK.

“They were clearly in the wrong, which is why they had to retract it – and formally apologise to me.”

Dorante-Day says that Detective Inspector David Smith, who was head of Royal Security at the time, described the ban to him as “without justification” and “extremely harassing”.

Please allow me to apologise on behalf of the Metropolitan Police for any upset and concern this situation has caused your family and hopefully you are able to move on,” Smith’s formal letter said.

Dorante-Day says he wants answers.

“I want a result on this one way or another – that’s all I’m after,” he said.

“I don’t want the money, the fame. I just want to know who my parents are. I don’t want my children to go through what I have to find out answers, and I will do what I have to to make it happen.

“But I won’t stop. The truth will come out eventually.”

This article originally appeared on Over60.