The rich occupants of Moore Street and the surrounding areas fear a supercar being dangerously driven will end up killing one of their neighbours after the driver was rushed to hospital with a serious head injury.

Noise and speed

A MailOnline investigation into the problems caused by the cars clocked engines revving at almost twice the legal limit for a car — 74dB.

One modified Ford Mustang was up to 126dB, roughly the same level as a rock concert.

And several cars tracked by a speedgun were found to be going almost 60mph, twice the 30mph limit.

Kensington and Chelsea Council wrote to the government asking for "acoustic cameras" which record motors' sound level and dole fines out accordingly.

But fines might not deter many drivers, as supercar owners are often seen flouting the rules around London and fork out for the penalties without taking any real damage to their hefty wallets.

But speeding is only half the problem.

A black Mustang was recorded doing 126dB on a device limited to 130dB.

And a red Pontiac Firebird not far behind it came in at 117dB, along with a modified Mini Cooper (115dB) and a Range Rover SVR (114dB) — all well over the 74dB legal noise limit for road cars.

Residents' fury

For Ali, 46, who lives just off Sloane Square, the supercar season is annoying because they come to the city for two months making a racket and clogging up the roads while admirers take pictures.

But they then leave without even paying parking fines.

Ali said: "They are people who just come for a holiday, that is their only purpose. They just come to entertain themselves.

"It just creates such congestion for the residents around here."

He added: "As a visitor you might see a Lamborghini or a nice Ferrari speeding down the road and you might like it, but as a resident you are definitely not liking it."