London: In a new twist to the Princess Diana episode, the Scotland Yard is to investigate evidence that a letter produced by Paul Burrell suggesting that Prince Charles wanted to kill his wife was not written at the time that the former Royal butler has claimed, a media report said.

The alleged dating of the letter, which is to be studied as part of a police review of inquest evidence into the death of Diana, has been used to support conspiracy theories that she was murdered, 'The Sunday Telegraph' reported.

According to Burrell, the Princess wrote in October 1996, just 10 months before her death, "This particular phase of my life is the most dangerous - my husband is planning 'an accident' in my car, brake failure and serious head injury in order to make the path clear for him to marry."

According to the report, 'The Sunday Telegraph' has discovered evidence indicating that the letter if genuine was written much earlier than Burrell has claimed.

The Princess' closest friends also say that in October 1996 she was in good spirits and had resolved many of her conflicts with Prince Charles. They are convinced that the letter was written years earlier, which would suggest even more strongly that her death in the car crash of August 1997 was coincidental.

The couple's marriage was dissolved in 1996, with the decree absolute granted in the August of that year. Yet in her letter supposedly written just two months later the Princess referred to "my husband" not her former or ex-husband and to leaving the path clear for him to "marry" not remarry.