Liv McMahonTechnology reporterGetty ImagesGerman car making giant Volkswagen (VW) has introduced a subscription for UK customers wanting to increase the power of some of its electric cars.Those who buy an eligible car in its ID.3 range can choose to pay extra if they want to unlock the full power of the engine inside the vehicle.VW says the "optional power upgrade" will cost £16.50 per month or £165 annually - or people can choose to pay £649 for a lifetime subscription. The firm said it was "of...