As said look at all your dd's and check if they can be reduced. Also, phone insurance companies and check what you're insured for, thinking whether you really need every element. Ask if they can offer a discount for a long standing customer.
Get into the habit of walking (rather than using the car) if you're dropping something off locally or just need a few things from the local shop.
If you go out, take drinks and snacks or a picnic, that way you won't need to buy expensive food. We enjoy days out, but as a family often go on a walk or bike ride or play a game, all of which are free.
If you're buying presents, cut back a little - it all adds up.
Only buy clothes if you really need them, not just because you fancy treating yourself.
Look for cheaper food ideas, ie if you fancy fish have tuna in a pasta dish instead. Buy cheaper meats. Double check that you can't get things you're buying in Lidl cheaper in Tescos, ie Tescos own toilet rolls may be cheaper than what you can buy in Lidl. Maybe set yourself a food budget of £90 and roughly add up what you've got in your trolley. If it's likely to go over have a quick review on how to make it cheaper, ie swap one vegetable for a cheaper one, swap cake for a cheap packet of biscuits. Pasta and rice are great for adding cheap meats, fish, cheese to along with whatever veggies you have. I buy cans of tomatoes from Lidl and they're great for making a tomato sauce, just adding onion, garlic, peppers or whatever you have. Small savings all add up.
I'm sure you'll be okay, you're obviously very aware of what's coming in and going out - that's a great start.