Champs
BHRC = FUCHS Lubricant Motorsport UK British Historic Rally Championship    
MNHRC = HRCR Motorscope Northern Historic Gravel Rally Championship    
RALLY2 = Race & Rally Rally2 Championship    
SGP = ANECCC SG Petch Stage Rally Championship    

Class
B1/B2 = Category 1 - registered before 31/12/1967 - Cars up to 1000cc and Cars 1001cc to 1300cc    
B3 = Category 1 - registered before 31/12/1967 - Cars 1301cc to 1600cc, excluding Twin Cam engine cars    
B4 = Category 1 - registered before 31/12/1967 - Cars over 1601cc, including Twin Cam engine cars    
B5 = Category 1 - registered before 31/12/1967 - Cars over 2000cc, including all Porsche 911s    
C1/C2 = Category 2 - registered between 01/01/1968 and 31/12/1974 - Cars up to 1300cc and Cars 1301cc to 1600cc, including 2 value Twin Cam engine cars    
C3 = Category 2 - registered between 01/01/1968 and 31/12/1974 - Cars 1601cc to 2000cc    
C4/C5 = Category 2 - registered between 01/01/1968 and 31/12/1974 - Cars over 2000cc, including all Multi-value Twin Cam engine cars    
D1/D2 = Category 3 - registered between 01/01/1975 and 31/12/1981 - Cars up to 1300cc and Cars 1301cc to 1600cc, including 2 value twin cam engines    
D3 = Category 3 - registered between 01/01/1975 and 31/12/1981 - Cars 1601cc to 2000cc    
D4 = Category 3 - registered between 01/01/1975 and 31/12/1981 - Cars over 2000cc, including Twin Cam Multi-value engine cars    
D5 = Category 3 - registered between 01/01/1975 and 31/12/1981 - All other Twin Cam Multi-value engine cars    
E1 = Category 4a - registered between 01/01/1982 and 31/12/1985 - Cars up to 1600cc    
E2 = Category 4a - registered between 01/01/1982 and 31/12/1985 - Cars over 1601cc    
F1 = Category 4b - registered between 01/01/1986 and 31/12/1990 - Cars up to 1600cc    
F2 = Category 4b - registered between 01/01/1986 and 31/12/1990 - Cars over 1601cc    
G1 = Category K - FIA Appendix K Cars registered before 31/12/1985 - Cars up to 1600cc    
G2 = Category K - FIA Appendix K Cars registered before 31/12/1985 - Cars over to 1601cc    
T14 = Rally2 Challenge - Cars up to 1400cc, complying with Motorsport UK Regulations and Tyro Specification    
T16 = Rally2 Challenge - Cars up to 1600cc, complying with Motorsport UK Regulations and Tyro Specification    
ONE-FOUR = Rally2 Challenge - Cars up to 1400cc, complying with Motorsport UK Regulations    
OPEN = Rally2 Challenge - Cars 1401cc to 2000cc, complying with Motorsport UK Regulations (including FIA R2/R2T)    
OPEN-PLUS = Rally2 Challenge - Cars over 2001cc, complying with Motorsport UK Regulations (including FIA R3/R3T)    
SGP-1 = SGP Class 1 - Cars up to 1400cc    
SGP-2 = SGP Class 2 - Cars 1401cc to 1600cc    
SGP-3 = SGP Class 3 - Cars 1601cc to 2000cc    
SGP-4 = SGP Class 4- Cars over 2001cc