You might be surprised at the amount of **** it strips out then. Next village to us has a bio diesel refinery using oil seed rape (Colza), sadly it is illegal to use it in private vehicles here so almost all is shipped to Germany. Buses have a derogation in some places allowing use.
Nearest genuine commercial bio diesel pump to me is 25 miles away, sort of makes it unviable to go there for it. If there was one nearer would use it. The government won't push it's development and widen it's availability because it would lose to much money on fuel tax. I am surprised the greenies are not pushing it to be honest. Maybe they have another agenda.