Decant your washing up liguid into a pump bottle. You don’t use as much, so it lasts longer.
Use blocks of soap rather than hand wash - they last loads longer.
Try an cut your utility bills. Are your doors and windows draft proof? Fill any cracks and use insulating foam. Thick curtains keep the heat in. Don’t position furniture in front of a radiator.
I’ve bought microfiber clothes which I use with a white vinegar and cooled boiled water 50/50 mix. I think the vinegar is about 30p a bottle in Aldi. I hot wash the cloths after a couple of days use.
Maybe give up alcohol for a month? (That would probably save me around £50 a month!)
Freeze sliced bread for toast (even better if it’s a reduced price loaf).
Keep a couple of cheap pizzas in the freezer for emergencies. Much cheaper than ordering a take away or buying a ready meal.
Make home made soup. You can make a huge batch for 8 for about £2.00. Portion it out into freezer bags and freeze lying flat. You can then stack them like sliced bread in the freezer, and they defrost more quickly. I particularly like brocolli and white bean soup.
There’s a Jamie Oliver recipe for breakfast muffins which contains cottage cheese and sweet potato. These freeze really well. I have them for my lunch sometimes. They’re quick to make, and very filling. Quite cheap too.