Westfield has been developing its own, distinct appearance ever since litigation forced it to. There’s only so much you can do with a two-seat roadster that follows the same mechanical theme of a Caterham, though, so although you wouldn’t a Sport Turbo for a Seven, distinct similarities of theme still exist.

What has changed on the Westfield is the purity of line and form that a Caterham retains. The Sport Turbo looks less lithe and agile and less classical than a Seven, even though the underlying take is similar. It’s a bit like listening to a song with a sampled backing track and new lyrics. The same but different, in other words, and in this case (to many observers’ eyes) slightly less satisfying to behold than the original.

Matt Saunders Autocar

Matt Saunders

Chief tester
If you don’t want to faff with the roof poles in a downpour, you don’t have to; just throw the hood over the rollover bar, do up the poppers and it’ll keep the rain out just fine while you head to the café for a cuppa.

The hardware follows a similar theme. Caterham experimented with a turbocharged Vauxhall engine in the 1990s, but keeping it sufficiently cool proved difficult. Today, while endeavouring to meet emissions regulations while developing sufficient power, Westfield has thought the idea worth a look and has deposited a Vauxhall Corsa VXR motor beneath the Sport Turbo’s bonnet, where it develops precisely the same power and torque as in the VXR Nürburgring edition. It retains the same ECU and the engine is, in theory, serviceable by any Vauxhall dealer. It drives the back wheels through a five-speed Mazda MX-5 gearbox and limited-slip differential.

The chassis is a steel spaceframe, like most of these cars have, while suspension is by double wishbones all round, with adjustable dampers that are set up primarily for road use; Westfield expects Sport Turbo owners to only do the occasional track day. There is an unassisted steering rack (the slower of two available ones was fitted to our test car), and there are no driver aids. The Sport Turbo was homologated before last November, when it became a legal requirement for such models to be equipped with ABS and traction control.

Save money on your car insurance

Compare quotesCompare insurance quotes

Find an Autocar car review

Driven this week

  • Jaguar E-Pace P300
    First Drive
    19 November 2017
    Jaguar’s second SUV faces up to the Audi Q3, BMW X1 and Mercedes-Benz GLA. Tough task, so is the E-Pace up to it?
  • Jaguar E-Pace D180
    First Drive
    19 November 2017
    Not the driver’s car many would hope from any car wearing the Jaguar badge, but the E-Pace is an attractive and interesting addition to the compact premium SUV ranks
  • Subaru Impreza
    First Drive
    17 November 2017
    The fifth-generation Subaru Impreza is much improved from top to bottom, but a poor engine and gearbox keep it trailing in this competitive class
  • Ford Fiesta Vignale
    First Drive
    17 November 2017
    We get a first taste of Ford’s poshest Fiesta in turbocharged diesel form
  • Seat Arona
    Car review
    17 November 2017
    Seat is on a roll but can the Arona, its new junior SUV, cut it in such an ultra-competitive class?