Overview: A selection of highlights from the 2007 series, including an experiment conducted to determine the fastest way of travelling across London during peak time. James May decides whether the Rolls Royce Phantom Drophead Coupe deserves the title of the world's most luxurious car, while Jeremy Clarkson puts the speedy Ascari A10 through its paces. With Simon Cowell and Lawrence Dallaglio featuring in Star in a Reasonably Priced Car.