The rather startling fruit of Murray's F1 experience, the cars' secret is a remarkable compactness that could revolutionise the way motorists negotiate the urban jungle. Tiny enough to allow three to park in a conventional bay and narrow enough to allow one to overtake another in the same lane, they're heralded by experts as the holy grail of city-car design. Add to that the T.25's 74mpg economy and its ability to carry three people and their luggage in style, and you can see why the recently unveiled super-light prototype is the talk of the town.