Class A: All cars over 3001cc

Class B: All cars 2001cc to 3000cc

Class C: Lotus 1600cc 8 valve twin cam engine cars

Class D: All cars, except class C and E, 1501cc to 2000cc

Class E: GRP bodied cars up to 1600cc with single cam engine

Class F: Metal bodied cars up to 1500cc

Class I: Invitation class

Road registered, GT and two door coupes from the same era may be accepted at the invitation of the HSCC. 

A Vehicle Detail Form (VDF), available from the Office, will need to be completed at least four weeks before the event; an offer of acceptance or refusal will then be given within seven days.