body, including a wrap-around windscreen and fold-away fabric hood (convertible top) manufactured by Oxted Trimming Company. The 21 benefited from a considerably stiffer setup than a 7, due to the work on the chassis and having a full body. Comfort was introduced in the same minimalist style as the 7, adding just enough to make it a proper roadster without adding too much weight. Caterham, however, underestimated the effort involved in creating a completely new car and took far too long from its inception to deliver the first customer cars, seeing many people who had placed deposits defect to the Lotus Elise and other vehicles. Early ones were used as "prototypes", leaving customers to help iron out some of the foibles of the new car. The 21 never sold particularly well, with only 48 ever made. It had moderate racing success in the Belcar 24-hour series in Europe and is credited with helping Caterham develop the widetrack setup used in SVs (amongst other developments) and the CSR's sweeping interior is reminiscent of the original 21 design. Caterham SP/300.R The SP/300.R is a new track-only model designed by Caterham alongside Lola Cars. The SP/300.R is a limited edition with limited production to 25 per annum. Caterham 7 model line-up Chassis variants In 2010 Caterham offers three different chassis variants in the UK. Series 3 (S3) The most popular variant retains the same dimensions and layout of the Lotus 7 Series 3. Series 5 (SV) Caterham introduced this variant in 2000 to accommodate larger drivers (space is restricted in the S3 for drivers over tall.) Although visually very similar to the S3, the SV is longer, taller and wider and has significantly more space for taller and broader drivers with the added benefits of more luggage space, a larger fuel tank and more stability. The SV chassis is heavier than the S3. CSR (Series 6) The CSR was launched in 2005 following extensive research and development by Caterham with the objective of creating an improved Seven. The CSR is based on the larger dimensions of the SV but with a substantially revised and stiffer chassis, inboard 'pushrod' front suspensions, fully independent rear suspension, improved aerodynamics, potent Cosworth engines and a new 'integrated' dashboard layout. Model/trim variants Classic The most basic version of the 7 was traditionally offered with a 'live' rear axle but now comes with De Dion tube rear suspension found