When Audi set to work on the second generation of the A4, its priorities were to increase interior space and improve driver appeal. The firm succeeded on both counts, creating a real rival to the BMW 3-Series and Mercedes-Benz C-Class. It has handsome looks, superb build quality, beautifully presented interiors and a wide choice of highly developed, powerful and efficient petrol and diesel engines. It's not quite as rewarding to drive as its big rival the BMW 3-Series but is just as comfortable and well built.