My brother-in-law, Lawrence Abbott, took part in a recent London to Brighton ultra-vintage rally. He sent me this photo of an amazing machine. It is a Salvesen Steam Cart, built in 1895 as a commercial vehicle. Lawrence says it got to Brighton without breaking down but had to stop every so often to fill up with water. A good way of saving petrol but not a good way to cut down on carbon dioxide and other emissions. Looks a dirty way to travel.