Closing the gaps – £45

Putting the heating on during harsh winters is crucial, but often draughts can reduce the impact.

“Identifying and plugging up draughts around doors, windows and other gaps can help trap warmth in and make your gas spend go further,” Octopus said.

Setting the thermostat – £128

Using the thermostat as an on/off switch or boost can mean more gas is wasted, Octopus Energy said, warning: “You’ll be more comfy, more efficiently, if you set it and leave it on for while you need it.”