Naomi Gonzalostein -- the car of the title of the film 'Genevieve' is actually driven by John Gregson with Dinah Sheridan as his passenger. Kenneth More drives another car with Kay Kendall as his passenger. They are not driving in a rally, but the Annual London to Brighton Veteran Car Run which takes place the first Sunday in November.
'Genevieve' is a 1904 built Darracq - the car that Kenneth More drives is a 1905 Dutch Spyker.