Energy Saving:

Switch off all your appliances and unplug at the wall before going to bed at night, electrical items will still use electricity even while off if still connected. Do you really need to use the oven or microwave as a clock? A battery powered wall clock uses much less power.

Switch off your oven, hob and iron a few minutes before you need to stop using them - they will stay hot for a while. Heating devices use more power that anything else.

If you are by the kettle when it reaches the boil switch it off by hand - the automatic cut off will leave it boiling and burning up watts for longer. Instant coffee is better when made with water that is not quite boiling. Only boil the quantity of water you need, and use your Range oven if you have one.

When using your oven try to fill it! If you really need it on for only one thing fill the bottom up with cooking trays, cake tins etc - this will make it into a much smaller space to heat - it reaches temperature much quicker too.

Tumble drying is very expensive - line drying is free. When outside drying is not possible you can hang washing in a garsge to dry (just takes a little longer) or use dryer until damp and then finish off on radiators if on anyway, not too much humidity if clothes only damp.

Shopping around for electricity/gas suppliers (as recommended by Martin) has proven economical for us. uSwitch compares phone and digital TV prices for you as well as gas and electricity.

If you have your heating on a timer or thermostatic control try switching it on and off by hand as needed. This uses far less fuel.

You can buy special insulation sheets to put behind radiators to reflect the heat back into them. Cardboard wrapped in aluminium foil does this too.