IT'S all a game of numbers down at BMW lately with the introduction of numerous 2 and 4 Series models to the already lengthy line-up.

And as a result, the beautifully formed 4 Series Convertible replaces the 3 Series Convertible and it's likely to cause quite a stir.

It's slightly longer and wider than the 3 Series model and looks absolutely stunning from any approach.

With the hard-top roof up, it looks like a normal sports coupe but within seconds that folding top packs away neatly into the boot and it's converted into an open-top that oozes class, finesse, elegance and style.

This car featured 19-inch alloys with blue brake callipers, large twin tailpipes, front and rear fog lights, M Sport aerodynamic body-styling, adaptive LED headlights and plenty more eye-catching styling characteristics.

The interior is outrageously flamboyant and boasts Coral Red Dakota leather upholstery throughout with techno treats at every turn. Creature comforts include a head-up display, enhanced Bluetooth connectivity, BMW's Professional Multimedia package which introduces sat nav, BMW Apps, emergency call-out, real time traffic updates and lots more.

In addition there is a brilliant Harman Kardon sound system and connectivity to a wealth of media devices. And to beat off the chill the steering wheel can be heated and there are neck warmers to keep you warm with the roof down.

Comfort levels are remarkably good for a low-slung convertible and there is even room for passengers in the back too. The price you pay for choosing the convertible is a reduction in storage space - especially with the roof down, but that's a small drawback when the sun puts in an appearance and the open road beckons.

That's because the 4 Series is a fabulous car to drive and the open-top option really adds to the fun factor.

The driver can change gears manually via the steering wheel-mounted paddles or via the gear shift or alternatively simply let the car's automatic transmission go through its paces.

The 3.0-litre 306bhp petrol-driven engine delivers plenty of power and acceleration through the eight-speed Sport automatic transmission is very fast indeed. A choice of ECO, Comfort, Sport or Sport+ modes can be utilised to change the dynamics of the car and automatic stop/start helps preserve fuel in slow-moving traffic.

But economy aside, this is a car that likes to crank up the volume and show exactly what it's capable of. And believe me, it's not for the faint-hearted.

It can sprint to 62mph from a standing start in 5.5 seconds and tops out at a limited 155mph, but it's the ease in which it drives that cannot fail to impress. When pushed hard it reacts instantly, it cruises effortlessly at motorway speeds and in busy traffic it simply attracts plenty of attention from other grid-locked motorists.

The car is also packed with a comprehensive array of safety features and these include dynamic stability control, rain sensing wipers, automatic lights, a reversing camera, numerous airbags and a Thatcham alarm to keep any uninvited attention at bay.

All in all, the 4 Series is a very welcome addition to the BMW range and the open-top is the cream of the crop.