Cameron: Energy price fixing claims 'extremely serious'

David Cameron said suggestions that energy prices may have been fixed are "extremely serious," which is why the matter is being investigated.

He said it is important to make sure customers get a good deal.

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Electricity market rigging claim

ITV News has been told by a former energy trader the electricity market may have been rigged "for years" and "is worse" than what has allegedly been going on in the gas market.