Tucked away in a workshop under a London Underground line, cars are undergoing a green metamorphosis as they shed their cylinders, spark plugs and pistons for electric engines. “We don’t create the associated CO2 that comes from creating a new car and we’re not scrapping a perfectly valid old car. It’s win-win,” said Matthew Quitter, founder of London Electric Cars. London Electric Cars is one of the companies capitalising on the UK’s flexible regulatory environment and special affection for cars to help grow the fledgling sector. In the workshop, all kinds of cars have come to be reborn: Mini…