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The car runs on a biofuel called biobutanol and is made of whiskey residue, including kernels of barley and pot ale, which is a yeasty liquid left after fermentations, according to the BBC.

Edinburgh-based Celtic Renewables has developed a process to manufacture the biofuel biobutanol from draff and pot ale - barley kernels and a yeasty liquid that are produced when whisky is made and then usually thrown away.

Biobutanol also has an advantage over other biofuels.

The fuel, called biobutanol, is designed as a direct replacement for petrol and diesel and does not need the car to have its engine modified.

He added: "What we developed was a process to combine the liquid with the solid, and used an entirely different traditional fermentation process called ABE, and it makes the chemical called biobutanol. "And that is a direct replacement, here and now, for petrol". He added: "This is the first time in history that a car has ever been driven with a biofuel produced from whisky production residues.