Originally Posted by Derek

The more implausible the more unlikely it is to have happened.

A smallish team to take out a person no one in the UK is likely to have heard of or miss? Possible.

A team of tens of people on the ground plus planning, logistics and the subsequent coverup to kill possibly the most famous woman in the world in a built up area and a lifetime of keeping quiet? Into tinfoil hat territory.

If they wanted to kill Diana there would have been ample opportunity to do it in a far more discreet and definately fatal way.
Her bodyguard survived thanks to a seatbelt, people survive high speed crashes every day in modern cars. Again why risk an operation if you have to ensure the target is dead to prevent them pointing fingers.