You'll probably use more £energy charging your phone in the car, ie using petrol, rather than plugging it into the mains at home.
Don't worry about turning the lights out when watching TV, as long as you're using low energy bulbs, you'll only use a slither of a penny per evening.
Laundry - wash clothes less often. After a shower, dry your nethers with a face cloth so you can hang up and reuse your bath towel another few times.
Cooking - once water is boiling, eg pasta/veg, turn heat right down and lid on. Cook a meal to eat over 2 nights, so you can quickly reheat in the microwave the next night. Try not to use the main oven, if you do, cook several things at the same time. Consider something like an air fryer or remoska.
Showering - get a shower timer. Or navy showers - turn on, get wet, turn off, soap up, then a quick rinse.
Dishwasher - only run when full. Reuse plates etc if they're basically clean bar a couple of crumbs.
Ironing - don't bother!
Anything that heats up is what you need to focus on. Look at the wattages. A light bulb or phone charger using say 5W/hr, it doesn't need to even blip on your radar. But something like a main oven at 3 KWH or electric shower at 7KWH will greatly impact your bills.