If you do one thing...

Head to an energy comparison site such as Uswitch.com and see how much you could save by switching. Uswitch.com will find you the best deal based on your circumstances and usage, and covers all the major suppliers as well as smaller ones such as Octopus Energy and Ovo Energy. It’s free to use and Ofgem accredited so you’ll get independent advice. They often have exclusive deals and tariffs too, so it’s worth a look.