John Barnard: why I chose carbon - and the "double-Coke" shape

The ultra-successful British F1 design engineer, John Barnard, talks to Craig Scarborough about two of his signature creations - the carbon chassis and the "double-Coke" sidepod shape. Both, nearly 40 years on, are still in vogue. For more insights into John's approach to design and racing success, read John's newly-published biography, The Perfect Car.