Classic-modern: Electric-converted 1929 Rolls-Royce to be presented at show

In the 1960s, Rolls-Royce famously advertised its cars with the slogan, "at 60 miles an hour the loudest noise in this new Rolls-Royce comes from the electric clock." Now, a near century-old Rolls Royce can make the same claim as it has been converted to run on electric power.

English engineering firm Electrogenic, have revealed a 1929 Rolls-Royce Phantom II that has traded its 7.7-litre inline six-cylinder engine for a 93kWh battery pack and a 150kW/310Nm electric motor.

The four-door saloon, finished in a matte, textured black with a high-gloss bonnet has bodywork designed by HJ Mulliner & Co, was developed for a private collector who wanted his car to support his passion for a cleaner environment.

Electrogenic Director Steve Drummond stated, "this is undoubtedly the most complex classic car EV conversion yet attempted."

The battery pack affords a range of around 240km and has been integrated into the design of the car, so much so that they are now shrouded by a hand-crafted, polished and riveted aluminium housing under the Rolls' long bonnet.

There's no word on what the conversion cost, but if you are wanting to breathe some modern mobility into your classic, Electrogenic offers a range of kits to suit Land Rover, Jaguar, Mini and Porsche classic cars. They have previously turned their skills to a Citroen DS and even a Morgan roadster for other clients too.

The electric Rolls-Royce Phantom II will be displayed as part of this week's Salon Prive Concours show at Blenheim Palace, just north of Oxford in the UK.