The Wemo Insight Switch is a plug add-on that connects all your sockets and appliances to your Wi-Fi network, meaning you can easily control any device from anywhere in the world.

The little add-on can also monitor everything that’s plugged in at home, so you can see which devices are using the most energy and when. With a smart plug, there’s really no limit to the money you can save, but consumer watchdog Which? reckons you could end up trimming up to 15 per cent off your energy bill.

At £50 a go, these clever little gadgets will likely start paying their way after the first year.

Available at Amazon.