The Caterham Graduates championship is one of the largest in the country. The competitors come from a variety of backgrounds. A number have graduated from the novice Caterham Academy series, but these days most have made it their first foray into motorsport, or come to Caterhams from other race series. All classes run on Yokohama tyres. Caterham Classics race on list 1A A539s, whilst Caterham Sigmas, Caterham Supers and Caterham Megas use the stickier list 1B A048R – all are limited to using only three sets of tyres for the whole season