More than 60 sixty ”supercars” worth £6 million have been seized in a clampdown on boy racers using central London’s roads as their “own private racetrack”.A McLaren, Bentley, Rolls Royce, Ferrari and Lamborghini were removed in an operation against nuisance drivers who ride around Westminster at high speed in summer months.Fed-up residents have been plagued by motorists who park illegally and behave without consideration for others.