As you may be aware you can now change your supplier from the normal Endesa to another supplier, anything from Iberdrola to PepeEnergy etc.
On the back of your electric bill, the list of companies offering deals is available.
The cost won't change that much in my opinion as most of your bill is made up from taxes and standing charges. the way I have managed to save money is to change onto the day/night scheme, paying 60% less for the price of electric over night, which includes most of the morning hours.
drop me a reply if you have any questions.
Ian