Jeremy Clarkson reviews the Renault Vel Satis, BMW Z4, Mercedes-Benz SL55 AMG and Honda NSX Type R, while Richard Hammond takes the new BMW Z4 Roadster for a spin. Jason Dawe assesses the Volkswagen Golf as a used buy, and Jeremy puts his own car to the test. The Cool Wall makes its debut, and the grannies return to compete in a handbrake-parking challenge. Tara Palmer-Tomkinson is the Star in a Reasonably Priced Car.