A secret witness to the last hours of Diana and Dodi has admitted she fears "sinister" forces were at work.

Rebecca Murrell, 44, watched the Princess and Mohamed al Fayed's playboy son visit the father's villa outside Paris on the afternoon before the couple's deaths.

The wife of Ben Murrell, 42, one of Dodi's bodyguards, said: "I'm sick of people talking about a version of events I don't recognise.

"I am convinced there was something sinister going on, to the point where I doubt if even my own husband was telling me the whole truth."

Speaking of the afternoon of August 30, 1997, Rebecca revealed that Ben's colleague Trevor Rees, who was injured in the crash which killed Diana and her lover, was furious with Dodi.

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She said: "Trevor was in a foul mood. "He said that Dodi was being an idiot and messing with travel plans to impress Diana. Trev was effing and blinding and calling him a t**t.

"He was threatening to tell Dodi what he thought of him and quit his job."

"Ben even offered to swap roles with Trev for the day so he could stay and cool down. That would have put Ben in the car with Diana and Dodi."

Rebecca also spoke to death crash chauffeur Henri Paul, who did not appear drunk when he stepped out of his vehicle for a smoke.

She said: "I was leaning out the window and, as Henri was smoking his cigar, he looked up and said, 'How are you?'

"He had a spring in his step because of the special visitor but we all felt like that.

"There was nothing to suggest he was getting drunk."

Her estranged husband Ben has maintained the driver had been boozing heavily.

She said: "What I can't understand is why Ben didn't just report him and have him taken off the job."

Rebecca said the Princess charmed staff during her villa visit and was not upset, as has been claimed.

She said: "I knew instantly that Diana was in a good mood".

After the party left, Ben "bizarrely" offered to take her out for the night. She said: "We'd never been out in Paris. But on this night of all nights, when he was likely to be called back to work, he demanded we go to a bar nearby."

Rebecca said she grew suspicious of the discrepancies between testimony Ben was giving to crash inquiries and her own memories.

Amazingly, Rebecca was never interviewed by Lord Stevens for his probe and has not been called to give evidence at the inquest.