Entering his second year in FIA F2, Callum enjoyed a successful 2020 season by finishing as Vice Champion, taking three race wins, five pole positions and six podiums along the way. Of his three race wins, he had two Feature Race victories, including a sublime display at his home circuit of Silverstone to win the Feature Race by more than eight seconds. Callum took more poles than any other driver in the field.
Callum's 2019 campaign saw him make his debut in FIA F2 with Sauber Junior Team by Charouz. In an impressive campaign, Callum secured three front-row starts, one pole position at Ferrari's home at Monza, and two podium finishes - finishing the year as the highest-placed Ferrari Driver Academy member.
In 2018, Callum had a title-challenging rookie season in GP3, finishing 3rd overall with 7 podiums on seven of the nine-race weekends, taking two wins and one pole.
In 2017, Callum's final season in FIA F3, Callum took 7 wins, 12 podiums and 11 pole positions, including taking a commanding win of the Macau GP's Qualification Race at the FIA F3 World Cup. In the FIA F3 European Championship, Callum finished 4th overall, with more fastest laps and pole positions than any other driver.
In 2016, Callum’s second season racing cars, he finished 6th overall in the FIA F3 European Championship in 2016, and was also the highest placed British driver in the FIA F3 World Cup at Macau that year, with an overall 5th position for the Race 2 Grand Prix, and 2nd in the Qualifying Race.