Man who claims to be King Charles' son shares last letter to Queen

A man who claims to be the forgotten son of King Charles has shared the last he sent to the Queen (or granny, to him).

Simon Dorante-Day, from Australia - Queensland, of course - has been going on about how Charles and Camilla are his parents for years now.

The 59-year-old engineer has repeatedly shared 'evidence' to back his outlandish claim, and has even tried to make contact with the royal family.

Following the death of the Queen earlier this month, Simon has decided to share the last letter he sent to her back in November.

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"I think it's time - it's time for the world to read this," he told 7NEWS.com.au.

"I've kept the contents of the letter confidential until now, but with her passing I think it's appropriate to share my last correspondence with her.

"When she passed away, I was disappointed that she had died without responding to my message. That was my first thing - just sad, because that window of opportunity has closed."

In the letter, Simon - who has nine kids of his own - took the opportunity to lay out to the monarch why exactly he's so convinced he's her grandson.

Simon was born in the UK and adopted at eight months old, with both of his adoptive grandparents working for the Queen and Prince Phillip.

"Over the years of residing with the Day family, my adopted grandparents Winifred and Earnest Bowlden often spoke about the time they worked for the Royal household," he wrote.

"Then on my last visit to the United Kingdom in 1998, my adopted grandmother Winifred told me herself, that my birth parents were your son Charles and his wife Camilla."

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He also detailed how he believes his appearance was altered during his childhood through a series of medical procedures.

"I can certainly understand, and to some degree forgive, actions that have been taken in the past in relation to my existence, but I cannot forget what has occurred," he continued.

"These actions I believe were undertaken to conceal my true identity."

He rounded off the letter by appealing to the monarch to stop 'this global assault'.

He wrote: "It would be naive of me to think you are not aware of my claims. Nor that you have not been following events to date.

"Subsequently, you will all be aware of the actions I have recently commenced and the level of attention this has already received.

"I am writing on behalf of my family and I to ask for your assistance in coming forward and resolving this issue and stopping this global assault.

"May God give you the strength to come forward."