The stealthy, matt black concept is based around the range-topping CSR Superlight, but the addition of a supercharger to the four-cylinder 2.3 litre Ford Duratec engine increases power massively from 260 to 330 bhp – as the name suggests.

That means the X330’s equivalent power-to-weight ratio puts it ahead of the Bugatti Veyron (521 bhp per tonne) and the McLaren F1 (559 bhp).

The near 35% power hike is achieved by a Rotrex C30-94 supercharger, which provides a boost characteristic that rises linearly with engine speed. In other words, although the X330’s punch is greater at higher revs and speed, low-speed driveability isn't compromised thanks to an exceptional torque curve with over 221 lb-ft from 5,500 to 7,500 rpm – 20 lb-ft more than the CSR260.

As the X330 is an engineering test bed it is envisaged that some of the concepts will eventually find their way into production. To begin with the X330 will spearhead the British firm’s R&D into bioethanol power in the coming months as it seeks to assess the viability of alternative fuel sources in road and race applications and cement a further 50 years of history for the legendary Seven.