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And they should be on their guard understanding jargon as their cheaper hedged deals come to an end.

Some customers could even be forced to pay upwards of £300 to £400 a year more for their bills, it has been warned.

Gas and electricity consumers who are customers of nPower, Scottish Power and Coop Online are being urged to check their bills.

Mark Todd, who runs Energyhelpline.com, says customers should check all of the deals they have done with…

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