Although you don't cover buses, I thought you may have some thoughts about the new double-decker London bus featured on a recent ‘Top Gear’ programme. All-British in design and manufacture, it features a diesel engine that charges the batteries that operate the electric motors. Given that translating power in any form involves a loss of energy, this means that the diesel engine has to be larger to cover the power loss in charging the batteries. This creates more pollution. Then there is the pollution in manufacturing and then disposing of the batteries. To make this bus even more green it could have a series of small windmills of the roof to help charge the batteries while the bus is moving. Is this the way forward?