Rolls Royce Wraith is billed as “the most powerful and dynamic Rolls-Royce in history”. The first bit is easily dealt with: a turbocharged 6.6-litre V12 sends 624bhp to the rear wheels, ten per cent more power than you’ll find even in the new Phantom and Cullinan.As for the most dynamic? Well, you’d argue that’s not difficult, given Rolls has long mastered the art of hefty, comfy cars that are designed to soothe not scintillate. But the Wraith is based upon the Ghost limo, so it’s hardly got a s