Biodiesel Filling Stations

http://www.biodieselfillingstations.co.uk/

Not much in the Barking area - nearest I spotted was N18 (Upper Edmonton), but there's the possibility of mail order.

Biodiesel seems fine if it's re-using oil from cooking, but growing crops for biodiesel may displace trees that can absorb carbon and therefore worsen the problem it is trying to solve. Also, biomass crops may displace food crops.