The profit margin for energy companies has risen to £125 per customer per year, from £15 in June, regulator Ofgem says.

The margin demonstrates the "crass behaviour by energy companies", Tim Yeo MP, chairman of the Commons Energy and Climate Change Select Committee, told the programme - raising prices before a winter set to be the most expensive for energy consumers.

It highlighted two factors that were distorting the market, he said, that the energy market lacked "true competition" for consumers, and that there was a "lack of transparency" in the wholesale energy market.

"We just don't know what price these companies are paying for their electricity and gas that they are supplying to us," he said.

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