1400 Classes
1.4L Cars up to and including 1400cc with limited modifications.  These include all current and  former FIA Group N1 cars, cars that comply with a recognised ‘One Make Challenge’ technical  specification and vehicles conforming to the MSA Endurance Road Rally regulations which also  comply with the MSA requirements for Stage Rallies.

1.4C Cars up to and including 1400cc with a maximum of 8 valves, plus all cars up to and including  1,000cc.  Class 1.4C cars must not be fitted with remote reservoir suspension.

1.4S All other non homologated cars up to and including 1400cc and all current and former FIA  Group A5 cars.    ­   

Historic Classes
H2 For all cars registered and homologated before 1.1.75.   
H3 For all cars registered and homologated between 1.1.75 and 31.12.81.
 All cars in classes H2 and H3 must comply with the appropriate requirements of MSA  Regulations H283 to H312

Other Classes
N3* Current  and former FIA Group N cars over 1400cc up to and including 2000cc
N4* Current  and former FIA Group N cars over 2000cc and FIA Super 2000 cars
B10 Other cars over 1400cc up to and including 1600cc
B11 Other cars over 1600cc up to and including 2000cc
B12 Other cars over 2000cc Two Wheel Drive
B13 Over 2000cc Four Wheel Drive (including all Land Rover models and derivatives) that do not  qualify for Class WR1. The engine capacities stated are after multiplying the actual capacity by the  forced induction equivalency factor of 70%. This does NOT apply to Diesel engines.