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An estimated 1.2 million customers will be hit by the price rise, which takes effect from the start of October. Bills will increase by 2.6 per cent, or £10 a year, from £399 on average to £409. This is the first time that any of the major six suppliers have increased their main tariffs since the summer of 2008, and some experts warned it was an worrying sign that bills were on their way back up.
