[4] For 2021, Fairclough moved to a part-time season in the Fiesta Junior Championship driving for Jamsport with Ciceley Motorsport.

[6] The prize for winning the competition was a free seat in the 2023 F4 British Championship with a new team; ROKiT F4 Racing, which would be run by Hitech GP.

[8] Fairclough got off to a strong start to the championship, with 5 top ten finishes in the first 6 races, including a podium at Brands Hatch Indy.

[19][20] Fairclough also took part in a one-off round in the Euro 4 Championship at the Red Bull Ring with Hitech; he scored no points with a best finish of eleventh in the second race.

[21] For his efforts in British F4, Fairclough was nominated for the 2024 Autosport BRDC Award alongside Freddie Slater, Arvid Lindblad and Louis Sharp.