The Caterham R400 is one of the most focused, purposeful and uncompromising track/fast-road cars on sale today. Continuing Colin Chapman's ethos of performance through light weight, it's basically just two seats, some racy suspension and a smattering of carbon-fibre strapped to a 210bhp Duratec. So where's the ideal place to put this rasping little wasp through its paces - Spa? Mallory Park? How about central London...? That's not actually as crazy as it sounds, provided you go at night. Click here to see Tim Hutton doing exactly that.