During the 1950’s the Bristol Car Company were active in sports car racing and they made various versions of a model called the 450 including a very odd-looking LeMans racer, the 450LM.
However Bristol found they couldn’t afford to keep up with the likes of Jaguar and pulled out of motor sport. The 450LM cars were scrapped. Or were they? There is a story that one was saved by a very wealthy overseas businessman who kept the car in a secret location in London. When he came over to Britain about once a year, he is said to have taken the car out for a drive at night around the streets of London.
Since the car has never come to light in over 50 years this urban myth seems to be just that, a myth.