Here's a list of simple things you can do immediately

These will start to reduce your contribution to global warming. The items in this list will cost you no money at all and will in fact save you money.

 

Sign up to a green energy supplier, who will supply electricity from renewable sources (e.g. wind and hydroelectric power) - this will reduce your carbon footprint contribution from electricity to zero.

Turn it off when not in use (lights, television, DVD player, Hi Fi, computer etc. etc. ...).

Turn down the central heating slightly (try just 1 to 2 degrees C).

Turn down the water heating setting (just 2 degrees will make a significant saving)

Check the central heating timer setting - remember there is no point heating the house after you have left for work.

Fill your dish washer and washing machine with a full load - this will save you water, electricity, and washing powder.

Fill the kettle with only as much water as you need.

Unplug your mobile phone as soon as it has finished charging.

Defrost your fridge/freezer regularly.

Do your weekly shopping in a single trip.

Hang out the washing to dry rather than tumble drying it.

Go for a run rather than drive to the gym.

The following is a list of items that may take an initial investment
They should pay for themselves over the course of 1-4 years through savings on your energy bills.

 

Fit energy saving light bulbs.

Install thermostatic valves on your radiators.

Insulate your hot water tank, your loft and your walls.

35% of heat generated in the house is lost through the walls. Installing cavity wall installation to a medium size house could reduce your heating bills by up to £100 per year.

By installing 180mm thick loft insulation you could stop about 25% of your heating escaping through the roof.

Recycle your grey water.

Replace your old fridge / freezer (if it is over 15 years old), with a new one with energy efficiency rating of "A".

Replace your old boiler with a new energy efficient condensing boiler