It was the unveiling yesterday of the full sized clay model of a road going version of the Porsche 919 triple Le Mans winner that got me thinking. Mainly about what such a device would be like to drive with almost 900PS in a car that would surely weigh no more than 1,100kg. And I found myself wishing the car had progressed beyond a full-sized clay model, into some sort of production and, ideally, my hands at least for a short period of time. But no. It was a study only and no roadgoing version of Porsche’s latest Le Mans winner will be built.