As of September, the Driving Standards Agency will be introducing a new element to the driving theory test - fuel efficient driving - which will help future drivers cut down on carbon emissions as well as saving on fuel.
Further more, in the recently published version of 'Driving - the essential skills' they've included a whole chapter on eco-driving looking at various issues including use of the accelorator, carrying weight and so on.
From: BEST OF 2008: Eco-friendy and sustainable shoes