The car is powered by a 215bhp 1.6-litre turbocharged engine, making it the most powerful Mini yet. It can go from 0-62mph in seven seconds, while top speed is 140mph or 139mph if buyers opt for an automatic gearbox, which is a first for a John Cooper Works model.
The car comes with Mini's All4 four-wheel-drive system, which is also a first for a JCW. Brake Energy Regeneration and engine stop-start technology help the Countryman JCW achieve average fuel economy of 39.2mpg and CO2 emissions of 167g/km. Opt for the auto gearbox, however, and fuel economy drops to 35.3mpg while CO2 emissions increase to 187g/km.
The Countryman JCW comes with sports suspension and sits 10mm lower than the standard car.
We've already driven a prototype version on the Countryman John Cooper Works; read our review here.
Other features that mark it out from the rest of the Countryman range include a JCW bodykit and JCW logos on the radiator grille, tailgate, door sills and near the side indicator lights.
The interior is unique to the Countryman JCW, with specially designed sports seats, and Chili Red trim on the door and centre console.
The Countryman JCW goes on sale in September, with prices starting at 27,800, which is 5000 more than the Countryman Cooper S.