You'd rather pay less than more. Surely? I can't recommend this guy highly enough: Money Saving Expert . If you like getting stuff cheap then he is the man (including for energy - electric and gas). There are loads of recommendations and new information every week.
This site is pretty good for cheap energy too: www.uswitch.co.uk You've probably heard of them.
I get my energy from these guys who were the cheapest for energy when I looked: Atlantic Electric and Gas
Save on your Bills | The Energy Shop | Compare gas electric etc | Simply Switch | Unlocking Clean, Cheaper Energy | Renewable Energy | The Uncertainties
SAP Assessors | SAP Ratings | Energy Performance Certificates
Cheap Energy | Energy Performance | Performance Certificates | Energy Certificates | Cheap Certificates