Some ways you can save energy and money, as well as help prevent climate change, as suggested by the Energy Saving Trust:

• Turn your thermostat down. Reducing your room temperature by 1°C could cut your heating bills by up to 10 percent and typically saves around £65 per year. If you have a programmer, set your heating and hot water to come on only when required rather than all the time.
• Is your water too hot? Your cylinder thermostat should be set at 60°C/140°F. 
• Close your curtains at dusk to stop heat escaping through the windows and check for draughts around windows and doors. 
• Always turn off the lights when you leave a room.
• Don't leave appliances on standby and remember not to leave laptops and mobile phones on charge unnecessarily.
•  If possible, fill up the washing machine, tumble dryer or dishwasher: one full load uses less energy than two half loads.
• Only boil as much water as you need (but remember to cover the elements if you're using an electric kettle). 
• A dripping hot water tap wastes energy and in one week wastes enough hot water to fill half a bath, so fix leaking taps and make sure they're fully turned off!
• Use energy saving lightbulbs. They last up to 10 times longer than ordinary bulbs, and using one can save you around £45 over the lifetime of the bulb. This saving could be around £70 over its lifetime if you're replacing a high wattage incandescent bulb, or one used for more than a few hours a day.