pointless
On your immersion tank there should be a round plastic cover secured with a screw. Switch off the power to the tank and unscrew it. There should be a little dial you turn using a flat head screw driver. Ours is at 50c but 55-60c is the norm.
Every house we have moved into has always been set to 70c.
If you have a tank that you can heat off the boiler or the electric then switch the electric off. Heat it for 20 mins before you need it. A gas boiler should heat a well insulated tank in 20m. If when you open the cupboard door a lot of heat comes out then it isn't insulated enough and you need to add another red tank jacket to put over the original and 20mm thick pipe insulation on the pipes that get warm. If the tank is solid coloured metal it is insulated from the inside, you just need to do the pipes.
Things that use lots of electric;
Eclectic ovens
Hairdryers
Vacuum cleaners (unless you have a new one subject the new eu regs which will be cheaper to run)
Plasma tv and older lcd tv.
Halogen lightbulbs.
Washing at 60. I wash most things on cold after seeing on here that the clothes would still get clean.
The 70c cycle on a dishwasher.
Overfilling kettles
Immersion heaters. Our builders left ours on so the first week I had boiling water 24/7 until I cottoned on. I have it switched off at the consumer unit to make sure it doesn't get put on accidentally.
Things that we think use lots of electric but don't include phone and tablet charger, They use a penny to charge overnight, induction hobs use a lot less power than halogen/ceramic hobs and have timers so they can be programmed to switch off.
If you have a gas oven then that will be really cheap to run. If you have an electric oven consider a halogen oven. It cooks quicker and you're only heating 12-19l. My oven is inbuilt so it's quite small but it still has 53l of space to heat and a 2kw element.
You will have to ring them to ask them to clarify how much you use of each fuel. I am sure you probably never want to ring them again ever but it's worth asking, they should be able to calculate it while you are on the line.
If you don't have an electricity monitor then buy one, our old one was £10 but it pinpointed the high consumption devices.
At the moment our gas usage is £3 a month to heat the tank when we need hot water, roughly every other day as dh is taking showers. By contrast someone I know pays £85 a month because they wash up by hand and take very long showers every day.
If you have a combi boiler and a mixer tap anywhere then the boiler will momentarily fire up every time you run the COLD tap. This is because it's anticipating you will need hot water as well. If it's a newish boiler it should be safe to switch off when you don't use it.
If the boiler hasn't been serviced then now is the time to get it done, it will improve efficiency.
I will catch up later.