On Apr 10, 10:24*am, " wrote:
I meant buying big bottles of economy cooking oil from Asda's, as some
people do for unlawful use in their cars. I think using it in a
generator would be lawful (unless someone on uk. legal otherwise).

Perfectly legal for road use since changes in the revenue regulations:

http://www.hmrc.gov.uk/briefs/excise-duty/brief4307.htm

Someone who buys it from Asda's as cooking oil still needs to pay 27.1
pence per litre to the government in tax if they use it as vehicle
fuel:

http://www.vegoilmotoring.com/eng/legal-stuff

John