The redesigned five-door hatchback will launch with a choice of three diesel and two petrol engines, with on-the-road prices starting from £19,375 for a 116i ES rising to £24,720 for a 120d Urban or a 120d Sport.
The new 1er is 83mm longer, 14mm wider and 30mm longer in the wheelbase than its predecessor, with BMW saying it offers increased cabin dimensions and greater interior comfort.
In addition, 2012 1-Series has 30 litres more luggage space compared to its forerunner, for a total capacity of 360 litres, which can be increased to a maximum of 1,200-litres by lowering the rear seats.
There are five available engines at launch, all turbocharged. The petrol lineup includes a 1.6-liter unit delivering 136HP in the 116i for a 0-62mph (100km/h) sprint time of 8.5 seconds and a combined fuel consumption of 49.6mpg UK, and 170HP in the 118i (0-62mph in 7.4 seconds, 47.9mpg UK).
The diesel range comprises of a 2.0-liter turbo diesel available in three flavors with 116HP in the 116d, 143HP in the 118d, and 184HP in the 120d.
All models are rear-wheel drive and available transmissions include a six-speed manual or a new eight-speed automatic.
BMW UK said it expects to sell approximately 20,000 1 Series five-door models in its first full year on sale.
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