Champs
BRCT = MSA British Rally Championship for Teams    
BRCD = MSA British Rally Championship for Drivers & Co Drivers    
BRCM = MSA British Rally Championship for Manufacturers    
BRCJ = MSA Prestone Motorsport News Junior British Rally Championship    
BRCC = MSA Cadet British Rally Championship    
NRC = MSA National Rally Cup    
FMP = FMP Rally Challenge    

Class
BRC1 = BRC 1    
BRCP = BRC Production Cup    
BRC3 = BRC 3    
BRC4 = BRC 4    
BRC5 = BRC 5    
BRCJ = Prestone Motorsport News Junior BRC    
BRCC = BRC Cadet    
NATC1 = Class 1 All 2WD cars up to 1450cc    
NATC2 = Class 2 All 2WD cars between 1451cc and 1650cc    
NATC3 = Class 3 FWD cars between 1651cc and 2050 cc    
NATC4 = Class 4 RWD cars between 1651cc and 2050 cc    
NATC5 = Class 5 All 2WD cars 2050cc and over    
NATC6 = Class 6 All 4WD cars not in Class 7    
NATC7 = Class 7 Previously homologated FIA WRC Cars and any derivative FIA R5 out with its homologation    

Champs
GS = BTRDA® Gold Star Championship    
SS = BTRDA® Silver Star Championship    
TP = THOMAS Panels 1400 Rally Championship    
P = BTRDA® Production Cup    
H = BTRDA® Historic Cup    
RF = BTRDA® RALLY FIRST Championship    
ZR = MG ZR Rally Challenge    
ST = Fiesta ST Trophy    
E = MAXXIS MSA English Championship    
W = Pirelli MSA Welsh Forest Rally Championship    
NW = ANWCC Forest Stage Championship    
FMP = FMP Rally Challenge 2017    

Class
RF1.4 = BTRDA® Rally First cars up to and including 1400cc    
RF1.6 = BTRDA® Rally First cars over 1400cc up to and including 1600cc    
1400C = Cars up to 1400cc with:- (a) 8 valve engines (b) Engines with more than 8 valves that retain the standard fuel and inlet manifold systems (c) Engines up to 1000cc not eligible for the BTRDA Rally First Class RF 1.4 (d) Current and former FIA Group N1 cars    
1400S = All other cars up to and including 1400cc.    
N3 = Current and former FIAGroup N cars over 1400cc up to and including 2000cc    
NR4 = Current and former FIA Group N cars over 2000c    
B10 = Over 1400cc up to and including 1600cc, including all FIA R2B cars    
B11 = Over 1600cc up to and including 2000cc    
B12 = Over 2000cc two wheel drive    
B13 = Over 2000cc four wheel drive cars that do not qualify for Classes NR4 or B14, and FIA R4 cars    
B14 = Current and former World Rally cars with a sequential gearbox, plus current and former S2000 and FIA R5 cars and any derivatives there from    
H1 = All Historic Category 1 cars / Category 2 and 3 cars up to 1600cc / Category 4 cars up to 1400cc    
H2 = Historic Category 2 and 3 cars with single cam engines over 1600cc / Category 4 cars up t o 1600cc    
H3 = Historic C ategory 2 and 3 cars with multiple cam engines over 1600cc / Category 4 cars over 1600cc    

Champs
M = The MAXXIS MSA English Championship    

Class
1 = BTRDA Rally First cars up to and including 1400cc and FIA R1A and N1    
2 = All cars up to 1400cc not eligible for class 1, and RF1.6 cars    
3 = Over 1400cc and up to and including 1600cc, including all FIA R2B cars    
4 = Over 1600cc and up to and including 2000cc    
5 = Over 2000cc 2 wheel drive    
6 = Current and former FIA Group N/NR4 cars over 2000cc    
7 = Over 2000cc 4 Wheel Drive    
8 = All WRC, RRC . R5 and S2000 cars and all derivatives