Ford is launching a new even more efficient version of its 1.0-litre EcoBoost three-cylinder engine in the Focus – which emits just 99g/km of CO2.

That means no annual car tax and – if you live in London – no having to pay the congestion charge. The specially calibrated version of the 100PS returns a claimed 65.7mpg thanks to ultra-low rolling resistance tyres and revised gearing.