A sunny afternoon in the Eifel. I was on the Nürburgring Nordschliefe, a coil of unforgiving racetrack wrapped around the castle of Nürburg in the Rhineland Palatinate.

Jackie Stewart had christened it the “Green Hell” in far less cosseted times, when race drivers risked their lives on every lap. The name has stuck, perhaps because it describes the psychological as well as physical experience of driving it. A sense of foreboding unspools itself as fast as the pleasure of hurtling through its seductive turns and undulations. You know that somewhere in the serpentine complexity is a set of fangs.