People can be downright horrible on here sometimes. It doesn't matter how much or how little money you have, when you suddenly have less, it's worrying. We're not playing competitive misery here.
OP, I suggest you start by projecting your monthly costs based on actual bank statements - council tax, grocery shopping, petrol, etc. Don't just make up numbers, go through your bank statements to figure out what things are costing you.
Compare the costs with your income. If any of them are unreasonably high for what's coming in, it'll feel more obvious, and you'll feel more inclined to start slashing budgeted items.
Are you still paying per prescription rather than getting a pre-paid prescription card?
If any essential subscriptions are too high (e.g. broadband), have you been out of contract for a while? Can you re-fix somewhere else? New customers often get the best deals.
What are your regular recurring bills? Are they essential? For example, if you have a TV licence, Amazon and Netflix, you can cut two of those without reducing your quality of life.
Do you feel comfortable with what you're spending on food? I think shopping in Aldi or similar can be a false economy sometimes, because you have the transportation cost and they don't always have what you need. Online shopping can be better, as it lets you plan what you're buying and how much it's racking up to - letting you take some things out and replace them with cheaper stuff, etc. Shopping in person leads to impulse buys and plans being derailed. It's only worth doing if you're prepared to join the yellow stickers scrum.
Meal planning is the easiest way to save money. Batch cooking will reduce your energy costs, and planning nice meals you like will stop you from being tempted by takeaways. Buy a couple of supermarket treats - a fancy branded pizza for example may be an indulgence in a monthly shop, but compared to a Domino's, it's dirt cheap.
Learn what food can be downgraded. I'd never scrimp on free range eggs (I'd rather go without), but cheap store value spaghetti is fine. Whatever you're used to buying, go down a brand if you can (this tip doesn't work if you're already on the cheapest store value brands). If you don't like it, you can get the more expensive one next time. If you do like it, you've achieved a permanent saving.
If you're not sure there's anything left to cut, get on MoneySavingExpert and be honest with your budget there. The people on that site are very good at challenging numbers and spotting potential savings.