RE: "Off with her head" Well, as time passed the Powers That Be became a little more sophisticated when wanting to rid themselves of a problem wife.
Here is the story of another Princess of Wales:
http://en.wikipedia.org/wiki/Caroline_of_Brunswick
Do I think there are people/agencies out there who are capable of arranging "a convenient accident"? Oh, yes I do.
Do I think this was one of them? Don't know yet, but I intend to follow the story closely.
Looks to me like the driver, Henri Paul, was an active alcoholic who had been trying to clean up his act. A single man, never married, who loved flying airplanes. (He was reported to have been happy at having passed a medical exam required to keep his pilot's license some two or three days prior to the crash. With the meds he was taking, I can see why he was so happy to have passed the medical exam!)
Airplanes are expensive toys. Flying is an expensive hobby. His SALARY at the prestigious Ritz of Paris was abominably low - equal to somewhere around $35,000 - $40,000 per year US dollars. (The Royals also pay people abominably low wages) But he supposedly, per his friends and family, "made a lot of money on big tips".
I think he was a none-to-intelligent fellow who had fallen into favor with the "Big Boss" and was playing every monetary angle he could. Selling info to the paparazzi about what time Dodi and Diana were leaving the hotel and by which door they would leave is not too big a stretch. And for the equivalent of $2000 USD - and in a medication/alcohol haze/high - he may have thought he'd have himself a little "driving fun" that night.
This could have been a situation where someone was watching the overall scene for some time, with the instructions to "go for it when the time looks good".
I hope the Coroners Inquest requires the identified paparazzi members to testify. Thus far, we have no idea what any of them have had to say about what all transpired that evening.