Unplugging phone chargers is a myth. You're looking at about 4 pounds a year for 10 things. I'd rather pay 4 pounds a year for the convenience.
Get energy saving light bulbs, they use 12w vs 60w (same brightness). You can have 5 of them running using the same power as one regular one. Also, they last so much longer than regular bulbs too so it's fit and forget.
Steal internet if you can.
Don't ever be late on a bill, they'll charge you for it.
You can buy a plastic wrap that you can put up over your windows which get's rid of any drafts to cut down on your heating.
Depending on your living situation you could get away with turning off the heat on a night and having a space heater in your room. If you have a good thermostat you can set it to come on when you usually get up so you don't take your morning pee in the cold.