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The team reveal the extraordinary results of a test into the customer service of the Big Six energy companies. When it comes to answering a complaint, which big name is likely to be quickest? And which one came out by far the worst in the team's experiment?

Also in this episode, simple ways to bring down your energy bills and save yourself money, a family whose boiler cover didn't stop them being left without heating or hot water for months at the coldest time of year, and a woman with an uncanny ability to spot the mistakes in her neighbours' energy bills. As she identifies further errors that have left people seriously overcharged, why do the energy companies keep getting it wrong?