ìThere are so many things that only he knows and he did not put in his books.†

ìHe has told us to watch the headlines for the next few days as he says he will be making them.

ìPaul is very bitter over the way he has been treated by the Royal Family. As far as he is concerned this is major payback time.î†

Royal aides have admitted they are nervous about Burrellís appearance at the inquest. They accept he was closer to Diana than any other servant and privy to many of her most intimate details.

ìBurrell always has something to say and we await with interest what he says at the inquest,î said a senior royal aide.

ìHe owes us no favours and I am sure this will be reflected in what he has to say.î

Burrell flew into London over the weekend from his home in Clermont, about 35 miles from Orlando, and is due to appear at the Royal Courts of Justice tomorrow.

The coroner, Lord Justice Scott Baker, will tell the jury that Burrell had unrivalled access to Diana.

Burrell is expected to be grilled first over the warning he says the Queen gave him that there were ìdark forcesî at work in the country. The conversation came when Burrell met the Queen in private after Dianaís death.

Friends say Burrell is still smarting over his treatment by the Royal Family following his acquittal at the Old Bailey five years ago on charges of stealing £5million worth of the Princessís possessions.