Dr dear Dr: Why is there still some speculation 20 years later about the Death of Princess Di? Any light to shed on this mystery turned conspiracy theory?

In this tragic story of a routine car accident, a brief Chronographicum of the key salient events might be useful to the general readership at home:

• The Queen speculated about the Asian Doctor in Di’s life;

• A divorce followed from Charles;

• Martin Bashir conducted an interview at the BBC with Di - in it she confessed to feeling that there were 3 parties in the royal relationship, since Camilla quite bizarrely invited herself onto the honeymoon;

• A relationship soon began with Mr Fayed’s son, Dodi;

• A trip then was planned to the Ritz Hotel in Paris on the night in question;

• Henri-Paul was the driver and he was driving under the influence of alcohol;

• No seatbelts bar one were worn on the night of the fatal crash on the 31st of August;

• A crash was recorded by paparazzi alongside the Mercedes driving at great speed;

• An ambulance was called while Di was dying of internal injuries;

• It did not get to the hospital for a long pause of time;

• Di was pronounced dead on arrival, and a French priest was called to attend to her as she died - her last words being “Dodi, Dodi, Dodi - mon seigneur”;

• Secret services were officially not involved, though there was an inexplicable delay;

  So as a result of this factor, various conspiracy theories since then have arisen -

• It was all simply an accident with the blame going to the paparazzi chiefly - Earl Spencer;

• A foreign GB friendly secret service planned it all that night;

• The French secret service or Deuxieme Bureau planned it, being ideological republicans;

• An undisclosed Arab secret service acting for Dodi driving alongside planned it;

• The accident was ordered by interested parties unfriendly toward Diana back home in Britain following an obscure paper written about the marriage plans of a C called “Diana and Dodi - A Classic Case of Matrimonial Crimen”, unpublished MS, London 00;

• Then there is the so-calledCapt Smith Hypothesis, captain of the ill-fated Titanic of 1912 who drove the Titanic at huge speeds into the iceberg field because he was suicidal as that was his last voyage with the White Star company, and Henri-Paul was also suicidal that night - according to this psychologicum theory, he may have deliberately driven the car into the Parisien Tunnel Pillar - a new theory and one gaining more and more ground - so a simpler relational theory;

• Also, a khaki Army style Fiat car was recorded by paparazzi zooming along and ducking in and out of the way of the Mercedes, and this was never traced at the time, nor after, believed to belong to some agency that was foreign to France - an undisclosed secret service possibly ghosting the hapless couple;

• Of all of the above, the theory most favoured by more up to date conspiracy theorists and the one often backed by a simple analysis of human reason is the 3rd one above, something possibly pre-planned and pre-organised by the French Deuxiemes, since they had most to lose by the presence of a very popular Di on their soil, so popular as to threaten the very existence of the republican state thereover, since they were acting as die-hard republicans, something verified by other car accidents involving royals to the south in those years, like the death of the Prince of Cadiz in similar circumstances, legitimate claimant inter alia to the French Throne. A Royal Over Seas League agent called Cygnus reminds us. The French Fourth Republic was never keen to have royals - any royals especially youngish populist modernising royals - holidaying and frolicking in their backyard effectively relaunching the fashion brands of royalty all over the world from the lands of Glorious Post-Marie-Antoinette France. 1789 still current for many lefties over there. So that is the current state of play among theoreticians. Certainly, the death-bed conversion and then final reconciliation of Diana in a state of grace to the Christian Religion as a much-forgotten spiritual childe Rolanda, organised by the French priest concerned, was something not officially envisaged by the defenders of Diana at the time, but now seems to have been likely in hindsight. Still, it is all an imponderable mystery to this day, and few services can make head or tail of it all. A mystery indeed. No preferred solution favoured by this commentator - As Alexander Armstrong says - prefer not to say. Photos of her dying frame and her diligent French priest attending her do still exist but are locked away out of sight for the moment.