Martin Lewis has warned anyone living in a flat or a three-bedroom house could be paying more than they need to on bills.
People living in these homes need to make one simple change which affects their water bills. While you can't switch provider or go to a competitor for your water company, there is other ways that you can cut costs - especially those living in flats or houses with more bedrooms than people.
Speaking on the latest instalment of The Martin Lewis Money Show Live, the financial expert announced that there is a rule you can follow which can save you hundreds. One woman, who he referenced on the show, even saved over £1,000 thanks to Martin's advice.
