Energy efficient lightbulbs, and keep them off unless you absolutely need them on.
Get everyone in the same room, and only heat that one room.
No heating on at night at all - just extra blankets.
Cut down on kettle use.
I try to either use the hob or the oven, but not both. I also use the microwave a lot. Choose food that doesn’t need cooking.
Shop in the discount isle in the super market.
Charge phone at work.
Air dry my hair instead of using hairdryer.
Haven’t bought anything new for myself this year so far, just food, toiletries and house products
Very short showers, cut back on shampoo etc.
No takeaways.
Go through your subscriptions and see if you can cut any out.