The cars that run on lots of coffee | Letters

It's good to see that Cambridge is catching up with County Durham (Recycling waste into BBQ biofuel, 15 February).

Martin Bacon of Teesdale Conservation Volunteers, based in Barnard Castle, produced his first coffee-powered car in 2010 in conjunction with a BBC TV science programme, Bang Goes the Theory. It was driven from London to Manchester to launch a new series.