 ? It is a beautiful beast that had even hardened observers stifling a gasp when it was unveiled at last autumn's Paris Motor Show (Robert Lea writes). Now Jaguar Land Rover has pressed the ignition on the Jaguar C-X75, its hybrid electric supercar.  at a top-of-the-range price tag approaching ?1 million, the C-X75 could displace the Toyota Prius , selling for circa ?23,000, as the ultimate status symbol of the eco-friendly wealthy. The cars will be exclusive, as Jaguar admitted that it will make only 250. Its Indian parent Tata will bankroll a launch for sale by the end of 2013.  The C-X75 will have a top speed of 200mph and will be able to reach 60mph in three seconds. With its electric battery fuelling the car for the first 50 miles, carbon emissions could be lower than a Fiat Cinquecento.  Meanwhile, new car registrations in Britain are still falling. at 137,746 last month, they were down 7.4 per cent year-on-year.