Testing for difference between diesel and heating oil.

Around here (California) they refer to diesel with dye as "red dye diesel". It's put into diesel that is sold for off-road use....graders, tractors, etc., without that annoying road tax (about 48 cents per gallon here). On-road diesel vehicles are checked sometimes at weigh stations and some state boys sneak around to construction jobsites and check diesel trucks used by those grader drivers, etc. It's a $1,000 fine if you're caught. I've never heard of a car being stopped and checked for red dye diesel. That'd be a waste of their time since their chances of finding a culprit would be very slim.

Oh, you poor things...violin strings....

Try 48 PENCE (or more) per LITRE in Europe...

DAS