4. BMW i3
Like the i8, the BMW i3 is built from super-light carbonfibre and aluminium to offset the weight of its batteries, which are mounted below the floor to lower the centre of gravity and improve handling. There’s a fully electric version that offers a realistic range of up to 124 miles, or you can pay a bit more to get a range-extender with a two-cylinder petrol engine that can stop the batteries from running flat.
3. Toyota Prius
The latest Toyota Prius represents a significant step forward for the world’s best-selling hybrid car. It's even more fuel-efficient than its predecessor, equipment levels are impressive, and the interior is both more spacious and better finished than before. Perhaps more surprisingly, it's better to drive as well, allowing it to compete more closely with conventional rivals such as the Ford Focus and VW Golf.
The Audi A3 is such a good car that it was named What Car? Car of the Year in 2013, and it remains our favourite family hatchback. This e-tron plug-in hybrid version is a more expensive private buy than our favourite petrol and diesel A3s, but it makes a very cheap company car. And while it’s closely related to the Volkswagen Golf GTE, it offers a classier interior and a slightly more comfortable ride.