A "ginger extremist" who fantasised about killing Prince Charles so Prince Harry could become king has been detained indefinitely under the Mental Health Act.

Mark Colborne, 37, likened himself to the Norwegian terrorist Anders Breivik and made made plans to kill the Prince of Wales in his diary.

The jury heard Colborne bought ingredients to make the poison cyanide over the internet, and stockpiled dust masks, metal filter funnels, plastic syinges and latex gloves.

He was caught when his brother uncovered chemicals and diaries describing his racial hatred in his bedroom at the family home in Southampton.

Following a retrial at the Old Bailey, he was found guilty of preparing terrorist acts before his arrest on 3 June last year.

He was ordered to be detained under section 37 of the Mental Health Act, with a further restriction under section 41 "without limit of time" on the basis of two psychiatric reports.

According to The Telegraph, he wrote in his notebook: "I want to be a serial killer. I'm more of an Anders Breivik. I have left potential targets open.

"I was waiting for the opportunity to kill one of them. Let it be Prince Charles, which would be good."

He wrote that he wanted a "silent rifle", adding: "Take up a good position and put a bullet in Charles's head.

"He is protected but not too protected. I would sacrifice my life for that one shot.

"Kill Charles and Prince Harry becomes king."

Colborne claimed the diary notes were all a fantasy.

Judge John Bevan QC described him as a "warped individual" whose views were "repugnant to right-thinking people", The Guardian reported.

He added: “You have been consumed with rage at disparate individuals and groups and you write in graphic terms of bombing and butchery.