He co-founded a car import firm in 1902 and was a founder member of the Automobile Association (the AA), serving as chairman in 1922.

[2][3] Jarrott married Violet Aline Vyner in 1903, the former wife of James St Clair-Erskine, 5th Earl of Rosslyn but the marriage was childless.

[6] Jarrott's greatest success was winning the 1902 Circuit des Ardennes in the Panhard et Levassor, completing the 6 lap, 512 km race at Bastogne in car number 8, taking 5 hours, 53 minutes 39 seconds.

[7] But he failed to finish in the Circuit des Ardennes at Bastogne after his de Dietrich No 4 suffered multiple tire failures.

[10] In 1900 Jarrott became the UK agent for Panhard et Levassor in partnership with Conservative politician Harvey Du Cros who was already a director of Dunlop Rubber and importer of French Clément-Gladiators.