Peugeot has high aspirations for its 508 medium range model, which means that it needs to offer cutting edge electrified technology - and does in this plug-in hybrid form. There's a price to pay for the convenience of limited fuel-free mileage, but you'll gain some of the outlay back in lower taxation payments and petrol savings. Fastback and SW estate variants both feature with this set-up and there's premium packaging and appealing design to sugar the asking figures.