BMW is offering drivers drop-top thrills with lower bills – the BMW 1 Series Convertible is now being offered with two diesel engines, adding the BMW 118d Convertible and BMW 123d Convertible to the range.

The BMW 1 Series Convertible – which launched last October – now features a 2-litre turbocharged diesel engine (badged 118d Convertible) churning out 143bhp and 221lb/ft of pulling power, while returning 57.6mpg on the combined cycle.

The new BMW 118d Convertible emits 129g/km of CO2, meaning road tax will cost £120 this year and £90 next year. BMW claims it is the “most economical and least polluting convertible in its class”.

The stunning BMW 1 Series Convertible is also being offered with the award-winning 2-litre twin-turbocharged diesel engine producing 204bhp and 300lb/ft of pulling power – meaning a 0-62mph sprint of just 7.5 seconds.

This BMW 123d Convertible is capable of returning 52.3mpg on the combined cycle – more than a 1.5-litre Mazda 2 supermini – and emits 144g/km of CO2, meaning an annual road tax bill of £120.

Prices for the new BMW 118d Convertible start from £23,660, and £28,105 for the BMW 123d Convertible.

BMW celebrates 30 years of the famous ‘M’ division this year – marking the date the first BMW M1 from 1978 was built to compete in the ProCar series.

View more images of the BMW M1 Homage concept car

And the company recently sold its 300th M-badged model – a new V8-engined BMW M3 Coupe was sold to a customer in Regensburg, where it was built.

View more pictures of the BMW M3 saloon

The German carmaker has also announced two new special edition models – the BMW X3 xDrive20d SE Edition Premium, and the BMW X3 xDrive20d SE Edition Exclusive.

The BMW X3 xDrive 20d SE Edition Premium gets new 17-inch light alloy wheels, chrome exhaust pipes, a chrome kidney grille and ‘Space Grey” metallic paint.

The new BMW X3 xDrive 20d SE Edition Exclusive comes fitted with 18-inch light alloy wheels, ‘Mineral Green’ metallic paint and ‘Nevada’ leather upholstery.

View images of BMW’s M cars

Check out the BMW M1 Homage concept car: