The world's first car to use whisky for fuel has been test-driven in Scotland.

Biobutanol is intended to be a replacement for petrol and diesel and vehicles do not have to be modified to use it.

It is produced using a yeasty by-product from the distilling process, while many biofuels are made using crops grown to be turned into fuel.

A car was driven using the fuel for the first time on Friday at Edinburgh Napier University.

Celtic Renewables president Professor Martin Tangney said: "This is the first time in history that a car has ever been driven with a biofuel produced from whisky production residues.

"It is fitting to do this historic drive in Scotland, which is famous not just for its world-renowned whisky but also for being a powerhouse for renewable energy."

Celtic Renewables has been given a £9m Scottish Government grant to build a plant to develop the fuel, which is expected to be up and running by 2019.