Here's one for you, then?
Most news sources are saying that the Luton Airport carpark fire started from a single parked Range Rover diesel (only) vehicle that ignited somehow - there is still some VDO footage of the car parked, not that close to other vehicles, and with its nose in to the nearest wall.
In the VDO I saw, the fire had started, with bright yellow/orange flame coming from what looks to be the front end of the vehicle but with only thin, light density/light colored smoke emitting at the time.
I have experienced a few fires, mostly at sea, with the main fuel type being diesel. Ignited diesel typically chucks out heavy black smoke. I know that the diesel used is UK autos is cleaner than marine fuel but not that clean. I find it hard to see this initial event in the car park as a diesel-fueled fire. What do you think?