Back in the early 80's I came across a Hughes 500 that the owner was illegally running on red diesel. The give away was the red stain on the edp fuel filter. More alarming was the water tide mark half way up the filter. I reckon the fact that the engine was mounted at an angle as opposed to horizontal was saving the idiots life. Commercial diesel has a very high water contact naturally and below standard storage conditions add to the water content. Given the price of avtur is your life worth so little?
On the subject of dieselcars running on avtur, yes they will.
The lack of lubricity compared with diesel can lead to injector pump seizure, not cheap.
Colour is not the only thing customs and excise check. Apparently they have a new device which they insert into the exhaust gas flow, they also check specific gravity.
Go get your car crushed make their day, they are not nice people.