His Formula One career was short and unsuccessful, but he enjoyed great success in hillclimbing, winning the British Hill Climb Championship on a record six occasions.

Inspired by Peter Westbury's Ferguson P99, Marsh devised an unusual drivetrain which utilised four-wheel-drive while accelerating but rear-wheel-drive while cornering.

[1] "Once again Tony Marsh established himself in 1965 as "King of the Hills" by scoring Best Time of the Day at eight of the nine first championship climbs he entered, and setting new course records at Shelsley Walsh, Bouley Bay and Longleat.

[2] After winning another hat-trick of championships between 1965 and 1967, Marsh sold his car and left motorsport to concentrate on his engineering and farming interests, but in 1986 he returned at the wheel of the March-based Rovercraft.

In 1993, his co-driver Simon Law was killed in the car during the Brighton Speed Trials, a tragedy which affected Marsh considerably.