As you might expect given its name, the BMW 4-Series Convertible has had a lot of attention focussed on its hard-top folding roof.

But aside from the fact that the roof is the car's main USP, the UK's car reviewers have zeroed-in on this feature for a number of other reasons. Firstly, it is actually a very clever and well-designed folding hard top, shunning the current trend for traditional fabric systems. Even at high speeds, with the top down and the windows up (and the optional deflector in place), it is still possible to hold a conversation about whether or not to put the top back up.

But secondly, and on the downside, the roof adds around 300kg of weight to the car, which puts a substantial dent in its fuel economy figures. For instance, the Convertible's 55.4mpg compares to 60.1mpg found in the 420d Coupé.

However, at least the 4-Series Convertible’s clean lines are not worried by the presence of the hard top, impressing the UK's motor-journalist supremos with its sleek appearance.

Engines

Choice is a watchword in this latest BMW – not least as regards the selection of engines available. Eight units are on offer, ranging from the economy-focussed 420d up to the most powerful 435i.

You can also pick manual or automatic gearboxes, and two- or four-wheel-drive set-ups. In terms of trims, you can choose from SE, Luxury, Modern, Sport and M Sport.

Interior

As with most BMWs these days, the interior of the 4-Series Convertible is well-built, refined and logical, featuring an iPad-like infotainment screen through which you operate the stereo, satnav and vehicle settings.

Comfort and ride quality

Because of the extra weight from the roof, reviewers have found the 4-Series Convertible a little less fun to drive than predecessors, with around 70kgs of additional heft at the back when the top is down. This has resulted in a less-than-composed driving experience.

Ride quality has not been overly praised – certainly something to consider given the UK's increasingly lunar road surfaces. The optional M Suspension (standard on the M4) might at present be a good solution.

Gearbox

The smooth automatic version is a recommended optional extra – given the standard manual's stiff operation.

Safety

Euro NCAP's boffins have yet to crash-test the Series-4 Convertible, but the car on which it is largely based – the 3-Series saloon – was given the maximum five-star rubber stamp.

Along with six airbags and a series of electronic stability aids (all as-standard), you can also add a number of extra safety gizmos, including automatic braking if it appears that you're about to rear-end another vehicle in stop-start traffic.

The folding hard-top may be the most immediately interesting feature of this car, but ultimately it boasts all the usual refinement and quality you would expect from a BMW, with only a few quibbles.

 

  • Price from £33,950

 

 

  • Top speed 155mph

 

 

What the reviewers say:

 

  • What Car? 4/5

 

 

  • Telegraph 7/10

 

 

  • AutoExpress 4/5