In 2017 Harrison’s racing career started at just 5 years old, perfecting his race craft on his minimoto at Swindon karting. Which swiftly led into 2018 where he competed in his first ever race outdoors where he achieved 5th place finish in the Fab-Racing Rookie class. In 2025 Harrison clinched the FAB_Racing MK-MiniGP70 title taking his first Championship win. Following a winter of extensive testing in Spain, Harrison is riding under the LRA Moto banner in the R&G Moto4 British Cup throughout 2026.