Almost a year after we drove a German spec version of the plug-in hybrid (PHEV) version of Mercedes’ compact executive, we’ve finally got our hands on a UK right hand drive model in AMG Line trim. 

Outside, the only giveaway that the C300e is a bit different from standard is the badging and the extra filler cap on the left.   

Inside, you can’t miss the C300e’s 11.6in iPad-like touchscreen that curves out of the centre console for the latest MBUX infotainment system. A complex system that has been designed around personal profiles, after getting into the car you sign in and the car adjusts to your perfect driving position and even puts on your favourite radio station. 

Considering MBUX’s complexity, it’s surprising that it’s easy to use. Although, the “Hey Mercedes” voice recognition system doesn’t always pick up your instructions first time. Plus, while augmented navigation display shames many rivals, why does it have to obscure the whole screen when making direction changes? Why couldn’t it be incorporated into a head-up display?

Mercedes in our opinion make some of the nicest car interiors that we’ve driven, and the C-Class is no different, although we weren’t sure about the faux carbon fibre trim on the dashboard and centre console of our test car. Rear legroom is better than the last-generation car, but feels tighter than it should be – even for children. The most noticeable interior compromise of having the extra hybrid battery, is the noticeable drop in boot space – 140 litres in fact. Although still practical, the boot now totals 315 litres.  

The C300e is powered by a 204hp, 2.0-litre petrol turbo engine combined with a 24.5kWh battery and 95kW electric motor, equalling an impressive 313hp. So, the performance figures are impressive, but company car drivers are going to be keener on the 8% BIK charge, emissions as low as 12g/km, and official fuel economy at a scarcely believable 565mpg, with Mercedes claiming 68 miles on electric power alone. This is 27 miles more than its closest rival, the BMW 330e, can manage. It is credible too, as we saw 40 miles on our longest 228-mile round trip, which was mostly covered on the motorway, and it wasn’t fully charged when we set off. 

From start off, this C-Class automatically defaults to electric mode, with engine only being called on at higher speeds or when the battery needs recharging. Hybrid mode feels much the same, and the C300e is a refined and comfortable way to cover big miles – but it lacks the sporting edge and driving precision of the BMW 330e. 

Other dislikes are the transitions between the electric motor and petrol engine, which seem to get harsher when there’s little or no charge in the battery. Sport mode seems to work with the engine only, but we’re not fans of the harder edge it gives to the ride. Plus, the brakes lack feel and are hard to modulate. 

Finally, UK cars are only offered with longer Type 2 charging. As thus, Mercedes is quoting a three-hour charging time to full, which is sure to affect how long drivers can stay in full EV mode on long journeys.  

On the road, while this C-Class – like the rest of the range – handles tidily enough, you can feel the extra weight in corners. This Mercedes also has communicative steering, plus the second of the two levels of regenerative braking gives a welcome almost one-pedal drive. 

If you can’t go EV, the C300e must be one of the best plug-in models available and should be given serious consideration alongside the BMW 330e.

Mercedes C300e AMG Line 

P11D: £48,655

Residual value: 40.3%

Depreciation: £29,013

Fuel: £6,375

Service, maintenance and repair: £2,405

Cost per mile: 62.98p

Fuel consumption: 565mpg

CO2 (BIK %): 12g/km (8%) 

BIK 20/40% a month: £40/£81

Luggage capacity: 315 litres

Engine size/power: 1,999cc + 24.5kWh/313hp