So lets skip forward a few years to flying Utopia where a variety of certified compression ignition engines of varying horse power running on Jet A1 are widely available to GA. :)

Hands up all who think HMG's Treasury will leave the pump price where it currently is?

Sir George Cayley

The air is a navigable ocean that laps at everyones door

Running diesel cars with Jet (AVTUR)
 

Englishal: Yes. Although the fuzz would be able to smell you a mile away. :)

Some jet engines run for a while on diesel. Know someone who did this (in an emergency) on a Let410 in Africa.

This "bio-diesel" lark looks more and more interesting all the time: there is apparently a growing legal industry recycling waste fat into fuel, and one large supermarket chain is looking into the possibility of running its trucks off the stuff - that "chip shop on fire smell" could get more common.

It was somewhere down in Wales where the illegal diesel makers made the press, after the local Asda sold a year's worth of cooking oil in three months - they started rationing it to one litre per customer per day. There was a good Guardian article on the issue. But you might need an awful lorra lorra lard for aviation purposes...

It's quite straightfoward, the only fuel you can legally use in your diesel car according to C&E is DERV which oddly enough stands for Diesel Engined Road Vehicle fuel, tractors, JCBs, aircraft etc you can use red diesel, whether it's a sensible idea is another matter esp the low temp case.
How long before the Uncle Gordon whacks up the duty on LPG I wonder?

Englishal, you can't run a car diesel engine solely on Jet, but you could (albeit ilegally) add about 40% jet to diesel in summer & 30% in winter. However it wouldn't do your engine much good, the lack of lubricity in jet would cause excess wear, and Kero produces much less power in a diesel engine than derv.

It's also incorrect to think that customs couldn't catch you, some jet in the UK is from DPK (dual purpose Kero) which contains coumarin - an 'invisible' customs marker, easily detected by analysis.