Handcrafted modern racing thoroughbred is also road legal, but only 25 will be built. What if…? It’s a question that has dominated the history of the XJ13, a prototype built by Jaguar in 1966 in a quest to continue the marque’s legendary run of success in the Le Mans 24 Hours. Powered by a new quad-cam, 5-litre V12, the XJ13 was Jaguar’s first mid-engined car – and without doubt one of the most beautiful automotive designs of all time. Sadly, it remained unraced. A combination of internal po...