Plot: REVIEWS: Peugeot 407 • Volvo V50 • BMW X3 • Chevrolet Corvette C6 CHALLENGE: Hammond drives the Peugeot 407 as a pace car • Car Olympics: long jump Jeremy tests the new BMW X3 and discovers its limitations as an off-road and on-road vehicle. James tries the new Volvo V50 and wonders if it's as good as its rivals, while Richard having clearly drawn the short straw, drives the new Corvette