Ford has improved both the performance and efficiency of the Focus ST, in its latest generation.
The new model, based on the Focus that launched last year, is available with a diesel engine, alongside the flagship turbocharged petrol.
When it goes on sale in the summer, business drivers will be able to order a Focus ST 2.0-litre EcoBlue diesel, which develops 190PS and 360Nm.
It has CO2 emissions of 125g/km and promises average fuel consumption of up to 50.4mpg.
The diesel motor gives a 0-60mph acceleration time of 7.6 seconds.
Prices for the Focus ST diesel start from £29,495 (on-the-road), with benefit-in-kind tax costing from around £162 per month for a 20% taxpayer.
There is also a 2.3-litre petrol engine, which is more powerful, developing 280PS and 420Nm. It can accelerate from 0-60mph in less than six seconds - making this version the fastest Focus ST ever built. It emits from 179g/km and can achieve 34.4mpg.
Ford says the new Focus ST - based on the all-new car that launched last year - will be provide the best driving experience of any Focus ST.
It has lowered suspension, faster steering and larger brakes than a regular Focus, although Ford says ride comfort is not affected by the performance enhancements.
Exterior styling is enhanced with new bumpers, alloy wheels and a rear spoiler. Inside, recaro seats complete the transformation.
Technology includes a head-up display, adaptive cruise control, park assist and selectable drive modes.
Ford’s eight-inch SYNC 3 infotainment system comes fitted as standard.
The Ford Focus ST is available to order now in five-door hatchback and estate body styles.