The GB4 Championship is the UK’s best value entry level single-seater category, designed to make the step from karting or club racing into slicks and wings much more achievable.

GB4 acts as a direct feeder series to higher open-wheel categories, running in close alignment with MSV's already successful GB3 Championship. GB4 runs primarily on the same British GT race programme, offering teams an excellent platform from which to enter both series.

Graduates have since achieved success in GB3 and sports cars, while a rising number of female drivers have used GB4 to develop their careers, with 2024 runner-up Alisha Palmowski signed up by Red Bull Racing to compete in F1 Academy for 2025.

GB4 introduces a new car to the series for 2025, the Tatuus MSV GB4-025, which includes major safety upgrades including the halo, aerodynamic improvements and a change to a normally aspirated Mountune engine, while still allowing drivers as young as 15 to compete.

The winner of the 2025 GB4 Championship will again be rewarded with a £50,000 contribution towards their 2026 GB3 racing programme, the biggest fund available in UK junior single-seater racing. The lead female driver also receives a €50,000 contribution towards a potential F1 Academy drive.