More from The Guardian

Electricity and gas bills: now is the time to switch energy supplier

Getting a new fixed-price tariff before winter begins could save you £290 a year

Energy bills: switch now to save more than £300

With energy prices rising over winter, it is the perfect time to lock into a better deal

Simplifying energy switch process boosts savings, study finds

Trial finds consumers eight times as likely to change supplier if requirement to provide tariff details removed