Despite the fact that Caterham Cars acquired the rights to manufacture cars Lotus Seven, Chris Smith created a competing company and to create industrial machine kits with a very similar design and assembly method. This led to legal proceedings with Caterham (based on industrial design rights) in the late 1980s, which were ultimately settled out of court, resulting in Westfield improving and changing the design of its vehicles. While outside cars are very similar, Westfield and Caterham are quite seriously different in construction. Westfield prefers to use for body fiberglass, which traditionally uses Lotus for other models, such as Elise, Esprit and Elan, while Caterham makes bodywork from aluminum.
Westfield is also ahead in terms of technical innovation, such as an independent rear suspension and a wider frame. The company recently introduced a version of its SEi kit that uses donor parts from the Mazda MX5 Miata. There is also a set of SDV that uses Ford Sierra as a donor.
In the first season of Top Gear on the BBC, Westfield XTR2 under the control of the black Stig passed the test circle faster than the owner of the fastest lap time at the time - Pagani Zonda.
In December 2006, Westfield became part of the company producing sports cars Potenza Sports Cars Limited.