Possible Clues:

• Station wagons, in Stratford
• Land Rovers?
• Station wagons, in England
• What Brits call station wagons
• English station wagons
• Station wagons, say, taking part in Wacky Races
• Largish vehicles on motorways
• Property conveyancers?
• Vehicles, say, used in Wacky Races
• Station wagons abroad