Ann Robinson, Director of Consumer Policy at uSwitch, says it's hard to know how much companies are paying for their energy which makes it difficult to work out if consumers are getting a fair deal.
More top news
Socialite Tara Palmer-Tomkinson has been cautioned by police after a 'disturbance' at Heathrow Airport.
The NHS is to set up 11 centres to unlock the secrets of DNA and help develop tests and drugs to target cancer and rare genetic diseases.
Australian businessman named as Alan Sugar's newest apprentice and winner of a £250,000 investment in his fledgling company.