Kidston competed in numerous motor races including the Monte Carlo Rally, Isle of Man TT motorcycle races, and Shelsley Walsh hillclimb. As a naval amateur he raced a Sunbeam motorcycle up the hill climb in Hong Kong and conducted speed trials on the sands, bringing the bike with him in his submarine which was patrolling the China Station. Kidston entered the 1929 Irish Grand Prix Éireann Cup at Phoenix Park but was narrowly beaten by the Alfa Romeo of former Russian Imperial Guard officer Boris Ivanowski.
Kidston engaged in numerous motor racing competitions, including the Monte Carlo Rally, Isle of Man TT motorcycle races, and Shelsley Walsh hillclimb. As a naval hobbyist, he competed on a Sunbeam motorcycle up a hill climb in Hong Kong and conducted speed trials on the sands while aboard his submarine stationed at the China Station. Kidston entered the 1929 Irish Grand Prix Éireann Cup at Phoenix Park but was narrowly beaten by the Alfa Romeo of former Russian Imperial Guard officer Boris Ivanowski.