REVIEWS: Renault Clio RenaultSport • Jaguar XJS • Cadillac CTS • Nissan Cube CHALLENGE: Can you run a car on poo? Hammond investigates James drives the Jaguar XJS, Richard drives the Cadillac CTS and finds out if methane is a future replacement for petrol. Jeremy drives the Nissan Cube and the Renault Clio. Terry Wogan is the Star in a Reasonably Priced Car.