From the BBC website, a little extra help, if you don't switch often you really should, or at least check to see if you're still on the best deal.

I found the EDF Compare Gas & Electricity prices, when I use it it often lets me know I currently have a better deal, however there's lots of others out there like uswitch that are very helpful, here's the EDF one:

Compare our energy products - Our products - Save Today Save Tomorrow - EDF Energy

Here's the video from BBC: BBC News - Tips on keeping energy bills down

Energy firms have been accused of "Del Boy" sales tactics when encouraging people to switch their gas and electricity providers on the doorstep.
The Energy and Climate Change Committee says mis-selling is an issue that should have been dealt with years ago, although an industry body claims that rules on sales have been tightened.
As some energy providers prepare to put their bills up on Monday, Kevin Peachey offers a guide on how to save money.