Plot: REVIEWS: Koenigsegg CC8S • Renault Megane • Hummer H1 • Hummer H2 CHALLENGE: Crash testing the Megane with a real driver The 655bhp Koenigsegg records the fastest straight-line speed on the Top Gear track, but can it set the fastest lap time? A Renault Mégane is crash-tested and there’s the first look at the new Aston Martin V8 Vantage. While Jeremy drives the Hummer H2, Richard drives the Talon Riot Control Vehicle… through a Portacabin