There used to be a small co-op in Manchester that sold bio-diesel from throwaway cooking oil. Unfortunately it closed back in 2006, but economics change, and if the barrels of oil continue to march to $150 and maybe a change in the duties levied this form of business will be available in every conurbation. It's ideal for a co-operative solution.
Already off the mark is one in Bolton. Their website stresses no fresh oil and no palm oil is used which allays fears of the growing of crops to fill petrol tanks instead of feeding people.
Story in Bolton Evening News
Bolton Alternative Fuels Cooperative