Possible Clues:

• Vehicle is in Le Mans a short time before event's over
• Brit's station wagon
• Motor race rerouted, bypassing country
• Vehicle, say, in rally heading North
• Brake's condition checked during return run
• Vehicle
• Drunk at a secret saloon, perhaps
• Part of the State Carriages employed at Sandringham?
• Transport found in the East, say?
• Vehicle races dangerously round gallery