C'Ship
F = The Fuchs Lubricants Motorsport UK British Historic Rally Championship    
NH = The 2019 HRCR Motoscope Northern Historic Gravel Rally Championship    

Class
B2 = Cars up to 1000cc & 1001cc to 1300cc    
B3 = 1301cc to 1600cc (excluding twin cam engined cars)    
B4 = 1601cc to 2000cc (Including twin cam engined cars but excl Porsche 911's)    
B5 = Cars over 2000cc including all Porsche 911's    
C2 = Up to 1300cc & 1301cc to 1600cc including 2 value twin cam engines    
C3 = 1601cc to 2000cc    
C5 = Over 2000cc, all and multi valve Twin Cam engined cars    
D2 = Up to 1300cc & 1301cc to 1600cc including 2 valve twin cam engined cars)    
D3 = 1601cc to 2000cc    
D4 = over 2000cc including twin cam multi valve engined cars    
D5 = All other twin cam multi valve engined cars    
E1 = Cars up to 1600cc    
E2 = Cars over 1601cc    
F1 = Cars up to 1600cc    
F2 = Cars over 1601cc    
G1 = Cars up to 1600cc    
G2 = Cars over 1600cc    
LR1 = British Armed Forces Motoring Association    
LR2 = Invited Land Rovers of similar type to BAFMA specification    

C'Ship
G = BTRDA Gold Star Championship    
S = BTRDA Silver Star Championship    
B = BTRDA Bronze Star Championship    
P = BTRDA Production Cup    
R = BTRDA Rallye R2 Cup    
K = BTRDA 1400 Championship    
F = BTRDA Rally First Championship    
D = MRF ST Trophy    
H = BTRDA Historic Cup    
E = The 2019 Maxxis Tyres Motorsport UK English Championship    
A = The ANCC Stage Rally Championship 2019    
AC = The ANWWC Forest Rally Championship 2019    
SP = The S G Petch Stage Rally Championship 2019    

Class
N3 = Current and former FIA Group N cars over 1400cc up to and including 2000cc    
NR4 = Current and former FIA Group N cars over 2000cc    
R2 = All FIA R2 (B) cars    
B10 = Over 1400cc up to and including 1600cc    
B11 = Over 1600cc up to and including 2000cc    
B12 = Over 2000cc two wheel drive, including all FIA R3T cars    
B13 = Over 2000cc four wheel drive cars that do not qualify for Class NR4 or B14 and FIA R4 cars    
B14 = Current and former World Rally Cars with a sequential gearbox, plus current and former S2000 and R5 cars and any derivatives therefrom.    
H1/H2 = All Historic Category 1 and 2 cars and Category 3 and 3 cars with single cam engines    
H3 = Historic Category 3 cars with multi cam engines over 1600cc and plus all Category 4a cars and Category 4b cars up to 1600cc.    
H4 = Historic Category 4b cars over 1600cc which comply with R49.1.5    
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 RF1.0 class(d) Current and former FIA Gp N1 cars.    
1400S = All other cars up to and including 1400cc.    
RF1.4 = BTRDA Rally First cars over 1000cc up to and including 1400cc    
RF2.0 = BTRDA Rally First cars over 1400cc up to and includingg 2000cc