Overview:Tim investigates why it can cost up to £200 just to change a headlight bulb on a Renault Mégane. Vicki spends a day with Lewis Hamilton at the Brooklands Motoring Festival. Jonny sees what kinda car you can get if you swore off drinking alcohol for 3 years and saved the money instead. Jason goes powersliding in the new Porsche 911 GT2. Tom drives the new Mercedes-Benz SL63 AMG, crash tests a second-hand convertible in a rollover crash. Shootout: Tiff puts the latest Mazda RX-8 against the Nissan 350Z.