When we got the invite to test drive the latest Bugatti it seemed like Christmas had come early. Quite literally, in fact, as it was just a few weeks before Santa was due to visit. On closer inspection, however, it became clear that this Bugatti was something a little different. No, we wouldn’t be doing 250mph, and no, we wouldn’t be heading to a sun-soaked circuit in Germany or France. Instead we’d be doing 40mph at a chilly test track near Oxford.