My exclusive review of the 601bhp, £620,000 hand-built David Brown Automotive Speedback Silverstone

It’s a limited edition sister car to the Speedback GT that was introduced five years ago – a hand made, coach built performance grand tourer based on a Jaguar XKR platform and drivetrain. The Silverstone represents the company’s move to its new headquarters opposite Silverstone Race Circuit. Beautifully built, enticingly expensive, remarkably rare – only 10 of the 100 Speedback series cars will be Silverstone editions. And I’ve driven one!