I think it is deliberately vague and obtuse to prevent people from importing their own cars.
Remember the Guvmint takes 40% tax or something stupid for new car imports so people importing collector cars for cheap cuts their tax.
In the UK you can import anything you want as long as it is over 10 years old. This apratheid era draconian import law we have is a fkn shit thing. It stifles choice and inventiveness. Image if we could import cheap, cool cars with out limitation? We would have a massive tuning and servicing industry, Saffas are already huge petrolheads, imagine if cars were half the price we pay like the rest of the world? I would have at least 5 cars.