If you are into city cars and like a bit of one upmanship then you can go no further up the scale than this tiny Aston. So, in it's class it must be sub zero.
The only reason for it's existence is to keep the average carbon footprint/emissions average down across the whole range. In addition to that the original idea was to only make them available to buyers of new full size Astons. Not enough buyers took up the oppurtunity and they are for sale now to anyone with enough wedge (who won't care about the car itself anyway).