Twelve years ago, in 2006, the British Standard for non-road diesel (BS2869) was revised to allow the addition of FAME to both Gas Oil (Red Diesel) and Road Diesel (White Diesel). This was done to enable renewable fuels to be introduced into the UK under the Renewable Fuel Transport Obligation (RTFO). However this was rarely realised in UK Gas Oil supply chain, and to date most Gas Oil supplied by has been FAME free.