Aside from making sure all your windows and doors are shut tight, it's generally a case of just trying to use less – even a small reduction can save valuable pennies.
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Turn the lights off when you're out of the room, only boil as much water as you need in the kettle and turn those plugs off at the mains. Switching devices off completely could save you up to £30 a year according to British Gas! Make sure you keep furniture away from heaters as they'll prevent the room from warming up, and similarly, keep the oven door open after using it to warm up the room. It also might be worth getting your boiler checked out. Your boiler heats up your water and having a faulty/old model one can mean you consume more energy, sending your bills through the roof. Some organisations and companies will offer a free boiler checking service (although this should really fall under the responsibility of your landlord to organise). Lastly, pack your freezer as tightly as you can. When you open your freezer all the cold air comes rushing out, which means when you close it it'll use more energy to maintain frostiness and rack up a small fortune over time. Add bags of ice cubes or newspaper to keep the cold air in. Pretty cool, eh? Cool? Freezer? Did you get it?! (#dadpuns #sorrynotsorry).