Last in the series in which Philippa Forrester and Mike Smith examine transport technology. This week comedian Jo Brand and broadcaster Muriel Gray join them to take part in a race from Edinburgh Castle to Greenwich
Observatory in south-east London, with penalties being awarded for the environmental, safety and convenience costs of the different methods of travel used.
Series producer Sally Dixon ; Executive producer Saul Nasse (S) (W) WEBSITE: www.bbc.co.uk/tw