Championship for Sports/Saloon cars originally designed and built for road use:

Class A Silhouette Specials 2501cc plus

Class B Silhouette Specials 1601cc to 2500cc

Class C Silhouette Specials up to 1600cc

Class D Modified 2501cc plus

Class E Modified 1601cc to 2500cc

Class F Modified up to 1600cc

Class G Silhouette Specials with motorcycle engines