A challenge is set to see which is faster: a rock climber or an Audi RS4. The new Porsche Cayman Sis reviewed and there's a feature on the history of British Racing Green; part of which involves Richard driving a Vanwall; a recreation of the 1958 car which won the 1958 world championship.James and Richard turn their attention to radio-controlled cars - Top Gear style and Jeremy plays with a rather special Vauxhall Vectra VXR, but why is it worth £60,000?