This site may well have been seen before (if so I missed it) but with prices as low as 42p a litre being available, I though it may be worth a look.
Alan
http://www.go-autogas.com/?gclid=CIm98q6Z5MYCFTDItAod9JoGTg
Alan
http://www.go-autogas.com/?gclid=CIm98q6Z5MYCFTDItAod9JoGTg