While those unidentified culprits in and on 'pursuing vehicles' still evade a court of law due to deliberate inaction by British and French authorities, one of the most unlikely sources might well have thrown us one of the missing jigsaw puzzle pieces.
With a hat-tip to Sky's Mark White - and a public apology to him for ribbing his coverage of the lives of celebrities at the Leveson inquiry into 'Hackgate' - the new evidence is potentially explosive and throws fresh question marks over the 'thorough and relentless' investigation by both Operation Paget and the Diana inquest itself.
The Leveson media inquiry today heard from former News of the World journalist Paul McMullan who gave several mentions to Diana - notably about how she was betrayed by her gym instructor and with regard to how her death changed attitudes at British newspapers.
Yet it is what he mentioned about Diana's bodyguards which is the most explosive.
Here's what he said, quoted verbatim from the website of the Leveson inquiry:
10 I mean, some stories are worth a lot. For example,
11 Diana's whereabouts was worth much more than that
12 because that would be, you know, a front-page story. So
13 maybe if one phonecall saying -- as indeed we got from
14 one of Diana's bodyguards, that yes, they will be
15 landing at Helsinki airport at 3 o'clock this afternoon.
16 "Can I have £30,000, please? I need to pay my
17 mortgage." Yes, no problem, because that was a defining
18 story about -- as you know, Al Fayed married
19 Miss Finland, hence the Helsinki link.
The 'Miss Finland' reference is to Heini Wathén, Mohamed Al Fayed's second wife and Dodi's step-mother.
For those who've shown detailed interest into the unlawful killing of Diana, our Princess, you will know that before the final acts of her killing in the Pont de l'Alma tunnel in Paris there was another terrifying car chase that Diana endured.
Landing at Le Bourget airport, an obviously tipped-off 'media' pack was waiting for Diana and Dodi Fayed's party as they landed on the tarmac - much to the despair of Diana and Dodi. A hair-raising chase all the way into the centre of Paris then ensued.
What the Fayed hired bodyguards Trevor Rees Jones (the sole survivor of the Diana killing crash) and Kes Wingfield did not tell the Scott-Baker inquest was anything about occurrences during any trip to Helsinki that Diana may have taken.
Yet reading the McMullan evidence to Leveson, it sounds as though there are question marks over Helsinki.
Did Diana go to Helsinki and in what way was any such trip connected to her relationship with Dodi? If she did go, when did this happen and who were the bodyguards assigned to protecting Diana in Helsinki? We need answers to these questions as McMullan appears to be directly implicating them in betraying Diana's security for cash.
And were they in any way connected to later incidents at Le Bourget and the Pont de l'Alma tunnel where Diana would meet her demise in what, a jury has ruled, was the unlawful killing of a globally loved, very English Princess..?
Further, if these bodyguards - who we do not yet know the identity of - betrayed Diana to the newspapers, would they have betrayed Diana to parties who might have been 'planning an accident in [her] car' involving 'brake failure' and 'serious head injury', following her divorce from Prince Charles and her humanitarian campaign against the military industrial complex over anti-personnel landmines.
We do know that Diana's driver in Paris - Henri Paul - was in the pay of French security services.
So we really do need to hear more about these Helsinki bodyguards. Who were they? Who sold the security detail? Who were they connected to?
We can be sure that the investigative journalists who have sought answers into Diana's killing will be looking further into this one.
