The Energy Saving trust is a good place to start saving money on your energy bills and reducing consumption
Conduct your own free Energy Survey
Spend a few minutes completing the following questions and you'll receive a personalised report showing you how much energy and money you can save in your home http://www.energysavingtrust.org.uk/proxy/view/full/165/homeenergycheck
Grants and offers
As part of CERT carbon emmision reduction target many measures to improve effieceny are subsidised