The most surprising thing about our recent visit Gordon Murray’s Guildford design emporium, to view a new, Shell-backed revision of the T25 city car, was seeing the sheer scale of the efficiency improvements that have been liberated from the car.

When I first heard that the T25 concept was being “re-thought” with lots of help from Shell and a world-famous engine designer, Geo Technology, I have to say I wondered how much difference even these big-name experts could make, given that the car had been built from scratch by one of the world’s most accomplished designers to be ultra-light and ultra-efficient.

Furthermore, it had already proved itself to be massively more frugal than other road-going production cars in tests backed by Imperial College and the RAC.

Usually, if you want to generate headlines by making something better, it’s best to start with a product that isn’t very good in the first place. Yet Shell’s lubricant experts, Geo’s engine men and Murray’s own engineers have produced a remarkable cut in kerb weight (down by 12%), a big reduction in aerodynamic drag and impressive improvements in engine efficiency.