| 1A |
Historic Cars (Pre 1968), up to 1600cc excluding twin cam engined cars |
| 1B |
Historic Cars (Pre 1968), 1601cc to 2000cc including twin cam engined cars excluding Porsche 911/912 |
| 1C |
Historic Cars (Pre 1968), over 2000cc including Porsche 911/912 |
| 2A |
Post Historic Cars (1968 - 1974), up to 1600cc excluding twin cam engined cars |
| 2B |
Post Historic Cars (1968 - 1974), 1601cc to 2000cc including twin cam engined cars excluding Porsche 911/912 |
| 2C |
Post Historic Cars (1968 - 1974), over 2000cc including Porsche 911/912 |
| 3A |
Classic Cars (1975 - 1981), up to 1600cc excluding twin cam engined cars |
| 3B |
Classic Cars (1975 - 1981), 1601cc to 2000cc including twin cam engined cars excluding Porsche 911/912 |
| 3C |
Classic Cars (1975 - 1981), over 2000cc including Porsche 911/912 |