Many own property in the West End and come over after Ramadan to indulge their passion....SHOWING OFF ...plus to many of them the price of an Adventador is small change.
Not sure if there's any truth in it. I've also heard some Arabs student bought their sport cars in the UK, then left the logbook and keys in car when they leave the country after graduation.
Use the car park under Park Lane in the summer and look at what you're sharing the car park with. Have a look at what's parked outside the Park Lane hotels. A variety of gaudy KSA registered exotica to feast your eyes on!