Def switch rads off in unused rooms unless you have damp issues.
I would add;
Switch off anything with a clock on it. Oven, microwave etc. Switch it off at the wall.
Lower the hot water tank/boiler if it's a combi to 55c. Lots are set way too high.
Buy a spin dryer off eBay second hand for £30. They get so much water out, then your tumble dryer won't need to be on as long. Tumble dryers are huge consumers.
Use a halogen oven. Mine saved me £50 a year. It cooks things so much better too. I use wilko skewers through meat to speed it up more. They cost £30ish. Plus they cook quicker too & you can put the bowl in the dishwasher. I only use the main oven at Christmas and for pizza now.
You can wash clothes on cold. Whites, Sheets, towels and dishcloths need heat but clothes come out well on cold.
LED light bulbs are great, we have them everywhere.
At the weekend I'm going to use window film in our lounge, it has a sizeable window, a tiny window and French doors. It's freezing in there despite being a new build so I'm going to try the film.
Check appliance manuals, use the cheapest wash cycle. Ours is synthetics.
Our electric use is £5 a week, only the heating is gas.