Interest in electric cars has slumped to its lowest level for four years as an increasing number of drivers say they will stick with petrol-powered vehicles. Figures from the Department for Transport show that just 13pc of all drivers plan to buy a fully electric car as their next vehicle. By contrast, interest in combustion-engine cars has risen, with 37pc of motorists saying they will buy a petrol-powered vehicle, up from 31pc a year earlier. The figures represent a new setback to Labour’s plans to ban the sale of petrol and diesel cars by the end of the decade. The...