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The Continental was always a model child when it came to sharing. Very much a product of Volkswagen's profitable mania for platform recycling, the car infamously shares its underpinnings with the less-than-glamorous Volkswagen Phaeton. The tweaked 6.0-litre W12 engine came as part of the bargain and continues to this day as the 582bhp range-topper. However, with 384g/km of CO2 belching from its 12 cylinders, it must have been clear from the outset that the Bentley engineers would have to delve back into the VW Group parts bin if they hoped to satisfy their directors' environmental boast.

In best downsizing tradition, the forced induction unit they returned with is four pots and 2.0 litres short of the full W, and bristling with Audi technology. Already installed in the S8, the engine's most conspicuous party trick is its capacity for variable displacement (or cylinder deactivation). When the electronic management system detects a throttle opening consistent with a cruise or gentle acceleration, it closes valves in four of the eight cylinders, effectively operating as a V4. Reactivating them takes less than a heartbeat.

Nic Cackett

Nic Cackett

Road tester
In the front seats and with the hood down you'll remain remarkably unruffled. It's breezier in the back, but still quite bearable at a cruise

Bentley's own 6.75-litre V8 already benefits from a similar function, but the new 4.0-litre unit combines it with improved thermal management, an optimised, on-demand electrical system, lower-rolling-resistance tyres and, most important, the eight-speed ZF automatic gearbox that is responsible for a six per cent gain in efficiency on its own. Although most of these features are the result of Audi's expertise, Bentley is at pains to stress that, while not built there, the engine is finished at Crewe to a bespoke configuration that reduces total output by 13bhp but delivers 7lb ft more torque at 1700rpm.

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Compared with the GT, the GTC features a slightly more flared rear spoiler, which helps to taper the drop-top's profile neatly. At the front, the most obvious changes are to the headlights which are now ringed by LED lamps - the large, close-set twin headlights have long been a defining feature of the GT.

Externally, the V8-engined GTC has been very gently tailored to differentiate it from the W12 variant. The red enamel background on the winged 'B' badge is a nod to smaller-engined cars of the past, and is complemented by the gloss black mesh of a new radiator grille and air intakes. At the back, two 'figure eight' exhaust pipes have been added to signify the cylinder count up front.

Beyond the two engine choices, those looking for a little more grunt can get the subtley more aggressive Speed models, with the W12 churning out 626bhp and the V8 version 520bhp.

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