During the 2024 season, Mewse won the Patchquick Trophy and the Weston Beach Race, two notable events on the British calendar.
In 2012, the European Motocross Championship for the 85cc class (known as EMX85), was held as a single round event at the Matterley Basin track in his native Britain.
[11] On the back of his successful 2015 season, Mewse was signed by the factory Rockstar Energy Husqvarna team to compete in the EMX250 European Championship for 2016.
[13] Following this strong start to the season, Rockstar Energy Husqvarna promoted Mewse to the MX2 class of the 2016 FIM Motocross World Championship.
[14] Initially this change proved a big step for Mewse, but in the second half of the season he was able to post some impressive results – including a fifth place in race one at his home round.
Mewse received his first call-up to represent Great Britain at the annual Motocross des Nations in 2021, where his performance as the MX2 class rider helped the team secure second overall.
After recovering from this injury moved up to the MXGP category, making his debut for the Diga Procross KTM Racing replacing the injured Thomas Kjær Olsen.
With domestic commitments, Mewse was only able to compete in one MXGP class round in the 2023 FIM Motocross World Championship, scoring four points in Switzerland.
On the back of his result, Mewse was selected for the British team at the 2023 Motocross des Nations, making his second appearance at the event and helping his country to tenth overall.
[24] Following his return from injury, Mewse went toe-to-toe with 5-time FIM World Champion Jeffrey Herlings in the 2024 British Motocross Championship, beating the Dutchman on three occasions and winning the overall at round three.
He made two wildcard appearances in the 2024 FIM Motocross World Championship, showing good speed on both occasions including an eighth in the qualifying race at the Belgian round.