Alec have you had a look at this...
Free, free, free...Cheap Energy Club...
""How it works
We take the hard work out of being an energy tart. Come on board, tell us what your current tariff is and we'll tell you, if you're overpaying or not. Then, as many tariffs are only cheap in the short-term, we'll monitor the market for cheaper ones and email you (or text if you like) when you should switch.
Can't be bothered to switch for a £20 saving? Just tell us what you will switch for and we'll only email when you can save that amount. Bingo! It'll all be filled in for you - just click the button..."
http://www.moneysavingexpert.com/cheapenergyclub?utm_source=EC+Newsletter&utm_medium=Email&utm_term=04-Feb-13&utm_campaign=cheapenergyclub
From...
https://www.dover.uk.com/forums/dover-forum/free-free-freecheap-energy-club