Born in Shere, Surrey, UK, Mortimer is the son of Charles Mortimer Senior, a former motorcycle road racer and proprietor of the Charles Mortimer Race School based at Brands Hatch race circuit, Kent.
Mortimer was born in Shere, Surrey, UK, to Charles Mortimer Senior, a veteran motorcycle road racer who established the Charles Mortimer Racing School at the prestigious Brands Hatch circuit in Kent.