Tests on the remains of Princess Diana suggested she was not pregnant at the time of her death, a forensic scientist involved in the inquiry into her death has revealed.

However, the scientists also found that she was not taking the contraceptive pill.

The claim that Diana was pregnant and was murdered by the British establishment to suppress her pregnancy has been repeatedly made by Mohamed al-Fayed, whose son Dodi was killed with Diana when their car crashed in the Pont D’Alma Paris, August 31, 1997.

The theory has been widely adopted by conspiracy theorists who maintain that Diana's death was not an accident.

However, Professor Angela Gallop, the author of “When the Dogs Don’t Bark: A Forensic Scientist’s Search for the Truth,” writes in a book extract in The Sunday Times that the investigative team pursued two separate lines of enquiry as they attempted to discover if Diana was pregnant: the first was to see if the blood samples taken from Diana contained any pregnancy hormones, and the second “was to look for any evidence that she might have been taking a contraceptive pill.”

However, because Diana had received blood transfusions, it was feared that taking a blood sample from her body might have given a false result. So, Gallop writes, “The best sample for testing was some blood that had been recovered from the carpet in the footwell of her seat in the Mercedes.”

Gallop and her team also “extracted a sample of her stomach contents for testing for contraceptive residues.”

Gallop writes: “In the end, the results of all the tests were negative. Which meant it was extremely likely that Diana was not pregnant at the time of her death, and that she had not been taking contraceptive pills.”

‘Extremely likely’ maybe, but don't think that means the Who-Killed-Diana theorists will be satisfied.