suspension, differential, driveshaft, interior, wiring and instruments) were provided in kit form. In the UK, the vehicles can be obtained as kits or entirely assembled by Caterham and registered for the road under IVA (Individual Vehicle Approval) regulations. In the '60s, the original Lotus Seven was sold only in kit form in both the UK and the US, in order to evade the very high taxes on complete new cars that were not assessed on automobile parts. United States As of 2014, however, Caterham has named Superformance their official distributor in the United States. International demand has increased dramatically in part due to the addition of a F1 Race team and the changes in Caterham's structure focusing on the distribution of the Seven worldwide. Caterham has since introduced a new model line up and focused on their production and production times to better suit their new international market, making their partnership with Superformance possible. Sevens will be shipped to the US in part-built form and sold as rolling chassis via Superformance's nationwide dealer network for customers to then complete the build personally or through the Superformance dealership. The initial US line-up includes several Caterham Sevens: 280, 360, 480, and the 620R. Location Until 1987 the offices, factory and showroom of Caterham Cars were located in the town of Caterham, Surrey. In 1987, the production and administration of the company moved to a new factory in Dartford, Kent. Caterham Cars retained a Caterham South showroom and servicing facility in the town of Caterham adjacent to the railway station until February 2013. The Caterham dealership closed after the premises were sold for development and the showroom relocated to temporary facilities in Crawley. Additionally the Caterham Midlands showroom operates outside Leicester. In 2012 elements of Caterham Cars moved into a new facility in Leafield, Oxfordshire, where it is expected the new models of cars to be produced in the future will be developed and built. This new facility was formerly used by the Arrows F1 team and the Super Aguri F1 team. The Leafield site also accommodated the Caterham F1 team, which moved from its original base in Hingham, Norfolk and competed in Formula One between the 2012 and 2014 seasons. Caterham 21 In 1994 Caterham also produced a model called the '21'. Mechanically the 21 was very similar to the 7, using a modified 7 spaceframe chassis with a new GRP roadster-style