Toyota is adding two new models to the Prius – a plug-in hybrid version of the current hatchback and a seven seat MPV. The first plug-in hybrid was supplied to its celebrity owner earlier this week – His Serene Highness, Prince Albert II of Monaco (it’s a good job our own Prince Philip doesn’t go by that title, don’t you think?). The headline figures are spectacular: 49 g/km of CO2 and 134.5 mpg, with a battery range of 15.5 miles. However, potential buyers should be warned that those figures are the result of the vagaries of the EU test cycle. Unless you can recharge the car from the mains every 30 miles, your fuel consumption and CO2 figures are likely to be around half the official ones. The price is £27,895.