Driving a car with doors open isn’t a great idea at the best of times, especially when it’s a million pound-plus concept car being edged through a curiously enthusiastic crowd. But driver Thomas Henkel and I are keen to edge forward with this Infiniti’s doors open, because this concept has no ventilation, no air-conditioning, no opening windows and a glass roof that instantly illustrates how a solar panel generates energy beneath a beating sun.

This Infiniti goes rather well with its 3.7 litre V6, but its role is really to sit on exhibition stands and look pretty, a task that its decidedly sensuous lines perform rather well inside the Goodwood Festival of Speed FoS-TECH Pavilion, where a collection of green concepts and prototypes provides quite contrast to the history roaring up Lord March’s driveway.

Read Autocar's Goodwood Festival of Speed report

 So what’s green about this elegantly indulgent-looking coupe? The fact that, were Infiniti to build it – and more on that shortly – it would actually be propelled by a parallel hybrid developing a over 600bhp, 434bhp of it erupting from a twin turbo version of the V6, the remaining 158bhp provided by a lithium-ion powered electric motor.