It's pedal to the metal time again with the boys off to Isle of Man to decide which is best, an Aston Martin V8 Vantage, BMW M6 or a Porsche 911 Carrera. They also discover whether you can buy a decent Italian supercar for under £10,000. James May and Richard Hammond race from Italy to London in plane against Jeremy Clarkson who is in a Bugatti Veyron. Richard also faces a very chilly challenge to outlast a car at sub-zero temperatures. And among the Stars in a Reasonably Priced Car, former Formula One World Champion Nigel Mansell proves he's still got what it takes.