I would still have expected there to be leaks about it in that scenario.
What about the fact that Diana would have survived if she’d been wearing a seatbelt? That was the reason she died. The bodyguard survived the accident, probably for that reason.
There was also the fact that she hadn’t been expected to leave the Ritz until the last minute, there was no way that MI6 could have known about the sudden change of plan. The sudden change of plan was the reason why Henri Paul had been drinking that night.
There was also no motive. Diana wasn’t pregnant (her friend said she’d had her period the week before) and she wasn’t intending to marry Dodi, she was on the rebound from a broken love affair.
I also can’t believe that the Royal Family would have wanted to hurt William and Harry by killing their mother. Diana and Charles had actually been getting on somewhat better at that point in time as well.
I also don’t believe that the Royal Family are that powerful that they could get MI6 to murder someone got their own ends like that, not for national security reasons. (Unless it was connected to Diana’s land mine campaign, which did irritate some powerful people. But the ban happened anyway.)
Personally, I think it’s a case of people not wanting to believe that Diana could die so senselessly in a car accident. But so did Princess Grace of Monaco.