The 0.9-litre TwinAir engine was made available on the vehicle last year but has now become a spec level in its own right, with tailored styling features including black alloy wheels, burnished metal effects on dashboard and front and rear mouldings, spoiler, chrome exhaust pipe and sports seats.

Two versions will be available – TwinAir and TwinAir Plus – for both 500 (hatchback) and 500C (convertible) versions.

The TwinAir range will include sporty looking mouldings and metallic effect dashboard, sport kit (chrome exhaust pipe, spoiler), sport seats, black interior surround, 15-inch matt black alloy wheels and air conditioning.

TwinAir Plus adds the following features: 16-inch matt black alloy wheels, automatic climate control, Blue&Me, sport leather steering wheel with eight commands, leather gear knob, dark tinted windows and body-coloured door mirrors.

The models will only be available in vibrant colours such as Pearlescent Red, Tropicalia Yellow and Electroclash Grey. A special colour, Midnight Black, is available only on the TwinAir Plus model.

'TwinAir and TwinAir Plus will become the best offer for Fiat 500 customers,' says Elena Bernardelli, marketing director, Fiat Group Automobiles UK.

'The combination of lively performance, high equipment levels, great value for money and undoubted green credentials make the TwinAir range a wonderful proposition for Fiat 500 lovers everywhere.'

The new range starts at £11,600 OTR for the TwinAir, rising to £12,700 for the TwinAir Plus.