I run an old (96) Vauxhall Combo 1.7D because it will run on home made biodiesel.
The last Labour goverment passed a new law so you can use 2500 litres of bio diesel per year without paying any extra tax or having to declare it.
I buy new clean veg oil (£1 litre) and put 5 - 10% petrol in it and a dash of Cetane.
I have done over 11,000 miles on it now without any trouble.
Anschutz 2013 MEC1 .22LR
Miroku 3800 12bore