If you are with edf energy you can probably get a better deal without switching, but they won't tell you unless you ask them.
1 Phone them free on 0800 0969696
2 Press the option number for changing supplier (you will get straight through to a person!)
3 Tell them you are thinking of switching and ask if they have a better tariff. (have your current bill handy)
4 They will offer you a better rate till next September called the "price saver tariff). It has no lock in or penalty for leaving early. Could be for gas, or electricity, or combined.
6 My first post. How was it?