The GT Cup was formed in 2007, designed to be run "by racers, for racers". The championship has continuously grown in popularity and is now a well-established part of British motorsport and an ideal feeder series to the likes of the British GT Championship.

The GT Cup is primarily focused on helping amateur drivers to improve their skills, and provides a pathway for drivers to move up the ladder in national or international sportscar racing, with many drivers moving from GT Cup into British GT, GT World Challenge or even the World Endurance Championship. There is also room for experienced professionals, who may choose to compete in the GT Cup due to its competitive grids and exciting format.

Each GT Cup weekend features 4 different races, meaning every driver and team gets lots of competitive time on track. Each day has a a quick qualifying session, split into two groups, before a 25-minute sprint race - with the driver who qualified the car doing the whole race. After that comes the endurance race, also called the pit-stop race. This is twice as long as the sprint race, and in this race, each car must pit and change drivers. 

Unlike the British GT championship, the GT Cup has six different groups of cars taking part in each race. These are GTO, GT3, GTC, GTB, GTH and GTA. Paddock Motorsport are competing in the GT3 and GTH categories, with 3 cars in total and 6 different drivers.

The GT3 category is simply for GT3 spec cars. Paddock Motorsport enjoyed a dominant campaign in 2025, with Mark Smith scoring 16 outright race wins from the 22 rounds, securing the GT3 Drivers' Championship aboard the team's McLaren 720S GT3 Evo. The team has previously also been multiple race winners with noth the McLaren Artura GT4 and older generation McLaren 570S GT4.