Demand for electric and plug-in hybrid vehicles is soaring, according to new figures released today by the UK’s Society of Motor Manufacturers and Traders (SMMT). The data shows the number of new cars eligible for the government Plug-in Car Grant scheme rose from 14,532 in to 28,188 last year, an increase of 94 per cent. Zero and low emission vehicles still make up only a fraction of an overall market, with total new vehicle registrations…