Prince Andrew is alleged to have 'lobbied' the Queen and campaigned against the marriage between Charles and Camilla - an explosive new royal book has revealed.
Royal author Angela Levin's new book on Queen Consort Camilla claims that Andrew had suggested a plan which would have seen Prince William become King if the Queen died before William was 18, with Andrew to become Regent.
Ms Levin claims a 'senior insider' told her that the Duke of York 'plotted' with Diana and his ex-wife Sarah Ferguson to prevent the Queen's eldest son from becoming King.
A source also claims that Prince Andrew was 'very nasty' to the now Queen Consort telling the Queen that she was not trustworthy.
'Andrew lobbied very hard with the hope that Charles would not become king when his mother died, and that William would wear the crown', she said.
Ms Levin added the Prince 'lobbied very hard' to try and prevent his older brother from taking to the throne.
A 'senior insider' at the palace is said to have told Ms Levin: 'When Diana was alive, through her friendship with Andrew's wife Sarah, [Duchess of York] she plotted with Andrew to try to push Prince Charles aside so Prince Andrew could become Regent to Prince William, who was then a teenager.
'They were dark and strange times, where paranoia became reality, and this was a worry.
The explosive claims are in Angela Levin's new biography, based around Camilla's life
'His behaviour was very, very negative and extremely unpleasant to Queen [Elizabeth], who disagreed. I was told it was one of the rare occasions he didn't get his way.
'Nonetheless, he was apparently very angry that he couldn't rule the country in some way. He remained so hostile to Camilla's emergence and acceptance that it's doubtful it has ever been forgiven.'
The Duke of York and King Charles have reportedly had a strained relationship over the years, which has worsened dramatically since Prince Andrew's ties to paedophile Jeffrey Epstein emerged.
When Buckingham Palace announced in January that the Prince would be stripped of all his military titles and patronages, and would defend his sex abuse case against Virginia Giuffre as a private citizen, it was understood the now-King had been instrumental in influencing the decision.
Buckingham Palace and the representatives for the Duke of York have been contacted for comment.