It has been the Next Big Thing for longer than most people can remember but there are signs that the much-derided electric car may finally be poised for its moment in the sun.For Costing the Earth, Tom Heap visits the factory where a major European car maker's latest electric supermini takes its place on the same production line as its petrol and diesel cousins.And he discovers that experts believe that success will come this time thanks to a combination of improved technology, commercial imperatives and a hefty dose of EU legislation.

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