British Gas customers can slash their energy bill by choosing the free electricity as an option on the energy giant’s Rewards scheme.

Customers with an online account can find the deal on British Gas’s Rewards page.

You don’t choose the five days to get for free yourself – instead British Gas will use your average electricity usage to work out the discount and apply it to your next bill.

If you’re a British Gas customer, you can claim up to 20 free energy days a year, depending on how long you’ve been a customer.

British Gas launched Rewards in April 2017. Other offers include discounts on Sky services, bundled British Gas Homecare services, and energy tariffs bundled with Hive Active Heating and other smart home technology.

The free days will come in useful for households facing higher energy bills due to staying at home during the coronavirus pandemic.

According to CompareTheMarket.com, lockdown could see a 37% rise in energy bills as people use appliances such as TVs, computers, dishwashers and ovens more than usual.

The price comparison website warns this could push up household bills by an average of £32.31 a month, or £387 over a year if similar usage continues.