Technically there are three other routes (assuming the Northwest Passage isn't open )Out of interest, while 30 days is about right for a direct route to Southampton, are there routes that could take much longer? I'm wondering if what we're seeing here is the last of the Q3 cars, loaded at a similar time to the last main chartered vessel, but loaded on to smaller boats on less direct routes to get them out of the way?
In order of probability: 1. Around the Cape of Good Hope (South Africa), 2. Across the Pacific - Panama Canal - Across the Atlantic and 3. Across the Pacific (a bit of Southern Ocean) - Cape Horn - Across the Atlantic.
In practise all three would be extremely unlikely as all of them add thousands of miles to the trip and I'm not sure taking a vehicle carrier around Cape Horn would be "fun" if the weather is bad (and this time of year it starts to get that way in the Southern Hemisphere).
I would stick to the Suez/Europe route