If you want to save energy, the place to start is
here:
first find where you get maximum benefit for minimum cost!
By now everyone should have energy saving light bulbs. They cost more to buy, but use next to no electricity and last for years.
Taking lamps as an example, I got nearly 90% of the energy saving by changing just 4 bulbs out of a total of 16. Lamps in the living areas like the lounge pay for themselves in as little as three weeks, but those in places like the pantry, cupboard under the stairs, loft etc are used so little they'll take over 50 years to cover the purchase cost of the bulb. The cost of running the dozen remaining tungsten lamps in my house at current prices is about 1.6% of my total electricity bill.
Put the water on for half a minute, get wet all over, switch it off. Soap up thoroughly everywhere. Now switch the water back on for another half a minute to rinse off.
That can be uncomfortable with an electric shower, they tend to blow hot & cold if you switch them off and on again. I leave mine on, but at 22%, it's my biggest consumer of electricity. My total consumption is about 2300kWh though, which is on the 33rd centile.
I read not long ago that after you finish a clothes cycle in your machine, put it on for an extra spin. My clothes always came out wetter than I thought they should so I tried this and it works a treat. It's brilliant and amazing how much drier clothes are.
My Indesit washer dryer finishes the wash cycle with a spin, starts the dry cycle, then 15-20 minutes later it starts spinning again. Makes you wonder why it doesn't just do the spin properly in the first place.