[3][4] Having made his debut at Rockingham, the Brit would return to the series for the second half of the campaign, managing to win the reverse-grid race in the final round at Silverstone after it had been abandoned due to heavy rain following two laps behind the Safety car.

[6] Despite this, Mason would manage to score three podiums in reverse-grid races, including a victory at Donington Park, where he overtook poleman Pavan Ravishankar at the Safety car restart.

Having been unable to prepare adequately for the season due to living with a high-risk individual at the height of the COVID-19 pandemic,[10] Mason only scored a sole podium at Donington and finished 16th in the championship, behind both of his teammates.

[12] His best result came at a wet Hungaroring, finishing fourth, as he ended up ninth in the standings, significantly ahead of rookie teammate Zdeněk Chovanec.

The following year, the Brit made the switch to drive for CryptoTower Racing for the 2022 season, having stated that he had "learned a lot in 2021" and that he was "really looking forward" to linking up with the team.

Mason grew up between Sussex and the Cayman Islands, and played both football and rugby union in his youth before chest surgery prevented him from furthering either career.