Jason continues his racing lessons on the track with newbie petrolhead Comedy Dave from BBC Radio 1, using an Aston Martin Vantage N420 Roadster. Jonny gets a ride in Europe's fastest street-legal car. Vicki heads to the glamorous Paris Motor Show and shows us the top five cars of the show.Shootout: Tiff puts the Porsche Cayman head-to-head against the Lotus Evora.