So will a diesel car run on Jet-A1 ? I assume its not red, so customs and exercise wouldn't be able to do you for running red diesel. At 2hundredandsomethingquid a tonne, its almost worth getting a big tank installed in my garage

My car ran on Avgas ok, I had to 'borrow' some to get home from the airport during the fuel strikes last year. Mind you it was a 1984 Ford Sierra, so pretty low tech, and needed plenty of lead to function.
On the subject of getting caught using RD, only customs can test your vehicle, not the police, but the customs need the police to stop you. You're really only likely to get caught if you're a crusty at a rave....[but even then then your penalty will be that the local authority will pay to get your truck fixed and road worthy and then send you on your way with a cheery wave....

]
EA