The shipping movements for Southampton are listed here:
http://www.southamptonvts.co.uk/live...ned_movements/
UECC are one of the main shipping companies. Their schedule can be found at:
https://uecc.com/pdfschedule/schedule.pdf
If the cars are at Cuxhaven port, then possibly the Prometheus Leader sailing from Cuxhaven 13/9 arriving at Southampton 15/9?
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Current: Porsche 718S Boxster. Tesla Model Y Long Range
BMW ancestry: G20 M340i, F36 440i Gran Coupe M Sport, F30 330d M Sport (RIP), F30 328i M Sport / E90 330D LCI, 330D, 325i / E46 325i, 320i / Merc 250 D AMG (listed to remind me never to buy another Merc!)