Consumer rights group Which? has welcomed the investigation announced by Ofgem into the UK's energy market.
"a watershed moment for the broken energy market and millions of people struggling to cope with spiralling bills" says Which?.
The investigation must leave no stone unturned in establishing the truth behind energy prices - says Which? @whichcampaigns
More top news
MI5 face mounting pressure over claims the IS executioner 'Jihadi John', named yesterday as a London graduate, was known to them
Labour leader Ed Miliband is due to set out his party's plans on how it would cut tuition fees.
New drug driving laws are to come into effect next week, including laws on some prescribed medications.