Audi’s new A1 and A1 Sportback models are available to order in the UK later this month, with prices starting from £15,390 and £21,650, respectively. First deliveries will take place in spring 2015.

Customers will also be able to order the enhanced Audi S1 and S1 Sportback versions, which cost from £25,380 and £26,110.

The new Audi A1 models feature exterior and interior styling enhancements, along with specification upgrades and new or improved engines – including the first ever three-cylinder petrol unit in the Audi range.

As a result of the new or tweaked engines, the fuel economy of the Audi A1 range has improved by up to 8%, while cutting CO2 emissions to as little as 92g/km.

When it first launches, the new A1 will be powered by a choice of two TFSI petrol engines and one TDI diesel unit.

The petrol offerings comprise of two versions of the turbocharged 1.4-litre TFSI: the 123bhp unit, which emits 115g/km of CO2, and the 148bhp version that emits 112g/km.

On the diesel side, the 1.6-litre TDI powerplant returns average fuel economy of up to 80.7mpg, while emitting just 92g/km of CO2.

In spring next year, a new turbocharged and directly injected three-cylinder petrol engine will join the range. Audi says that provisional data for the A1 1.0 TFSI 94bhp indicates that the model will be capable of returning at least 60mpg, while emitting just 99g/km of CO2.

All engines in the new Audi A1 range will be mated to either a five- or six-speed manual gearbox as standard, while a seven-speed S tronic twin-clutch automatic transmission will be available as an option for all.

The new Audi A1 will be offered in the same three trim levels as its predecessor: SE, Sport and S line, with each featuring specific suspension set-ups.

Standard kit is plentiful across the range, with all models receiving air conditioning, alloy wheels, a six-speaker single CD audio system with auxiliary iPod connection linked to a 6.5-inch retractable display, and a second collision brake assist system.

Moving up to the Sport trim brings larger 16-inch alloys, sports suspension, sports seats, Bluetooth mobile phone preparation, Driver’s Information System, Audi drive select, Audi Music Interface, and preparation for SD card-based navigation.

The top of the range S line specification further includes 17-inch alloy wheels, xenon headlamps with LED daytime running lights and LED rear lights, S line sports suspension, leather and cloth combination upholstery, and exclusive S line exterior styling and interior detailing.

Numerous option packages are also available, such as the Tech pack, which offers Audi connect, and the Comfort pack, which adds the likes of the Driver’s Information System and cruise control.

If you’re looking for even more power, then you will be able to opt for the new Audi S1 and Audi S1 Sportback variants.

Both come with a 2.0-litre TFSI engine under the bonnet and quattro permanent all-wheel-drive, with the unit producing 228bhp and 370Nm of torque.

Such power enables the three-door version to complete the 0-62mph sprint in just 5.8 seconds (5.9 seconds for the Sportback), before going on to reach a top speed of 155mph.