As part of the evolution of the series, the GT3 class of cars were introduced in 2005. This class later became identical to the FIA GT3 European Championship class, using nearly identical rules from 2006 onward. Due to the cost-saving measures in the class, the faster GT2 class was phased out at the end of 2006. The new FIA GT4 class will be adapted in 2008, replacing the unique GTC class that had previously been used. For 2010, the G4 category amalgamates GT4-homologated cars and Supersport-type machines.
The following drivers have previously won the British GT championships in their respective classes. An overall championship for all classes combined was also awarded until 1998, and those champions are marked with italics.