The new MINI hatch line-up will soon be complete, when the new MINI One and MINI Cooper D models are unveiled to the public at the International Geneva Motor Show in March.

The entry-level One features a perky 95hp 1.4-litre petrol engine, while the Cooper D boasts performance and fuel efficiency from an all-new 1.6-litre 110hp turbodiesel powerplant.

A Cooper-badged MINI diesel hints at the sporty nature of the new model. MINI fans will be equally excited at the prospect of the Cooper D promising to be the most fuel-efficient and cleanest MINI ever built. In comparison to the outgoing MINI One D's combined fuel consumption of 58.9mpg, the Cooper D is capable of 64.2mpg. A CO2 figure of just 118 g/km puts the car in tax band B.

MINI One also benefits from a significant improvement in both fuel consumption and emissions over the outgoing model. A figure of 49.6mpg is achievable from the One's new 1.4-litre unit, compared to 41.5mpg from its predecessor. CO2 emissions are now 138g/km, against 164g/km produced by the previous model.

The MINI One will cost £11,595 on the road, and the MINI Cooper D will be £14,190. Both models will be on sale from April.

They feature the new body shape already seen on the MINI Cooper and Cooper S models.

The 1.4-litre four-cylinder engine in the MINI One is derived from the 1.6-litre unit that features in the current Cooper model.

Maximum output of 95hp at 6,000rpm is produced by the compact engine, which is constructed from aluminium. The 5hp power increase on its predecessor leads to a peak torque figure of 140Nm at 4,000rpm.

It achieves 0-62mph in 10.9 seconds and has a top speed of 115mph.

The MINI Cooper D's new turbocharged diesel engine develops 110hp at 4,000rpm. Under normal conditions, peak torque of 240Nm is achieved between 1,750 and 2,000rpm. Deploying the engine's Overboost function gives the Cooper D an additional 20Nm of torque, meaning the driver will experience 260Nm at 2,000rpm.

MINI enthusiasts will recognise this torque figure is identical to that produced by the MINI Cooper S.

The turbocharger system ensures optimum smoothness, efficiency and response, even at low engine speeds.

A diesel particulate filter almost eliminates diesel exhaust emissions and helps to make the MINI diesel engine one of the most environmentally friendly engines in its class.

The new MINI One and Cooper D both come with a six-speed manual gearbox.

The MINI One will also be available with the option of a six-speed automatic transmission. A key feature is the Steptronic function, which allows the driver to shift gears in sequence using the gear lever or the standard-fit paddles on the steering wheel. For keener drivers, a Sports Button is available.

Features including a black finish to the car's radiator grille bars, door mirrors and tailgate handle. The new MINI Cooper D's sporting prowess is underlined by the addition of a pronounced power dome on the car's bonnet. A larger air intake than on other MINI models features on the Cooper D, as does a crossbaron the lower intake.

The go-kart driving experience is enhanced in the new MINI One and Cooper D through a new suspension set-up, as introduced on the MINI Cooper and Cooper S.

The new MINI Cooper and Cooper S went on sale in the UK on November 18 last year. By the end of the year, close to 7,000 orders were taken for the new models.