If you thought the current BMW naming strategy was confusing, look away now.

In an attempt to name models in a way only Carol Vorderman could understand, the German firm has released a new 1 Series called the 114d.

But it's not a 1.4-litre engine under the bonnet – it's a 1.6-litre.

Why has the maker done it? Well, according to a spokeswoman, that's now the plan.

"Names that follow engine sizes are no longer the trend at BMW," she said. "We now use badges which denote where that model sits in the range. So the 114d is the lowest powered, so gets the smallest badge."

The move won't please company car drivers though – a badge that looks like the engine is smaller than what's really under the bonnet won't go down well in the car park bragging stakes, that's for sure!

"It not a new thing for us, though," added the spokeswoman. "The 118d is a 2.0-litre and the 318d had a 2.0-litre engine too."

OK, so that's clear as mud, but what about the car? Well, the 114d uses a single turbo with twin scrolls to produce 95bhp and 235Nm of torque. It can hit 60mph in 12 seconds and go on to a top speed of 115mph.

However, the real headline figures are in the green department: CO2 emissions are just 112g/km and the combined fuel consumption figure is 65.7mpg.

The 114d manages this thanks to some clever "EfficientDynamics" technology which includes brake energy regeneration, a gear shift indicator, auto stop-start, low rolling resistance tyres and unique aerodynamics. The German firm has not revealed prices yet - but we do know production will begin in November.

Joining the 114d at the same time is a greener version of the perennial 3 Series. Again, confusingly, this will be called a 320i EfficientDynamics, but this actually has a 1.6-litre turbocharged petrol engine under the bonnet. It's likely, though, this naming convention will be a bit more popular – it makes the engine look bigger than it actually is!

The 320i EfficientDynamics will hit 60mph in 7.4 seconds, thanks to 170bhp and 250Nm of torque, and returns 53.3mpg thanks to optimised engine management, revised gear ratios and improved aerodynamics.

The 320i EfficientDynamics saloon will be available in November, priced from £25,730.

There is one solution to all this confusion though – remove the badges altogether!