The sixties icon has been reborn with evolved look and new parts – but what's it like to drive? I want to say that AC Cars is back, even though it has never really been away.But thanks to a big cash injection, the storied British marque has a new plan for its classic-shaped cars (watch this space) and, more significantly, an all-new model: the Cobra GT Roadster.It’s new but still looks Cobra-ish, no? Like when BMW reinvented the Mini or Fiat revived the 500, it’s an entirely different thing from a familiar shape.It’s bigger, too, of course, because people and components are bigger than they were when the Ace, from which the original Cobra morphed, was launched in 1953.