I am sweating nervously in the passenger seat as prototype Huayra Number Three is brimmed with fuel, when a man wanders over and starts jumping up and down on the car's nose. Violent, full-force leaps, again and again. This is not what you want to see a couple of minutes before you're set to ride along on an untested hypercar's maiden voyage towards 220mph. Words: Sam Philip Pics: Justin Leighton This feature first appeared in the April 2012 issue of Top Gear magazine