The S 500 Plug-in hybrid, available only in long wheelbase form, is powered by a 333hp V6 biturbo petrol engine alongside a 116hp electric motor that combined, generate a total of 442hp and 650Nm of torque. On purely electric power, this new model can travel over 20-miles before switching to the conventional petrol engine.

Exempt from road tax and receiving 100% discount of the London congestion charge, on official tests the S 500 Plug-in hybrid returns 100.9 weighted combined MPG while emitting only 65g/km CO2. Running solely on the V6 petrol engine, condition B MPG is around 44.8 (estimated). From rest, it can burst to 62mph in 5.2 seconds up to a limited max speed of 155mph.

Unlike Mercedes other hybrid engines (the 300 BlueTEC Hybrid and 400 Hybrid), the 500 Plug-in hybrid can be topped up using available charging devices. A typical full charge on public, three phase power points takes around 2 hours.

Specification on the S 500 Plug-in hybrid follows the structure of the conventional 500 L AMG Line - featuring equipment such as 19inch AMG alloy wheels, LED intelligent light system, COMAND Online, leather upholstery and a front seat memory package.

For company car drivers, the current BIK rate of only 5% (rising to 9% in April 2015) is certainly an appealing feature of this new model thanks to its low CO2 value and for those of you that fancy Mercedes-Benz's S-Class plug-in hybrid, you can configure one now using the link above or any comprehensive Comcar tax tool.