Depending on what engine and more importantly what fuel pump you have it can be as easy as pouring veg oil into the tank to mix with the regular dino diesel. To run pure veg oil I believe you would need some sort of heater to make it thin enough for the pump to handle, so blending seems to be the easiest way to go. I looked into it a while back, but unfortunately the PD motor is one that seems to be incompatible.
Don't forget to pay the VAT man!
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