If you have a high annual mileage, I would go for a hybrid. The Mercedes-Benz C350e petrol-electric hybrid is available as an estate so it's perfect for the dog. It can travel short distances using battery power alone – so there's the potential to save a lot of money on petrol if you can charge the battery at home and rarely do long drives. On the other hand, having the petrol engine to fall back on means you're not going to be left hunting for a charger mid-journey.

I'd also consider the BMW X5 xDrive 45e. It's also a petrol-electric hybrid but it has a longer electric range and its powerful six-cylinder petrol engine means it has loads of performance.

If you fancy going down the pure-electric route, I would recommend the Volkswagen ID.4. It's smaller than your Mercedes but should have a similar amount of interior space. It was designed from the ground up to be electric so takes advantage of its compact motors to give you an interior that feels very light and airy. Top-of-the-range models also offer a range of more than 200 miles and lively performance.