So some cheap meals I make, not sure if these would help you but it might reduce some of the food bill down:
Carrot and coriander soup (£1.11)
1kg of carrots (bag is currently 59p in tesco)
Coriander (52p for fresh in Tesco, I grow my own so cheaper again)
Literally chop the carrots up, boil with salt and pepper, throw the coriander in once the carrots are soft and blend it.
I get 5 good size bowls out of this, sometimes I double and freeze.
Pappa Al Pomodoro (£2.72)
This should be done with fresh tomatoes but it can be adapted
Two tins plum tomatoes (4 for £2 on clubcard offer, so £1)
Crusty baguette (Tesco 65p)
Basil (Tesco 52p)
Garlic (Tesco 55p)
Heat up a few garlic cloves in oil, salt, and then add the two tins of tomatoes, fill the two empty tins with water and empty into the pot, cook over a medium heat for 15 mins or so, tear up the baguette and mix in with the basil. It's like a chunky, stodgy tomato soup. Traditionally Tuscan peasant food, it's excellent for using up overripe fresh tomatoes or stale bread. I get 4 decent bowls out of this. Doesn't freeze very well.
Tomato Pasta
With the other two tins of tomatoes, the basil and garlic, I stick that in a pot and cook it with some water into a tomato sauce. Much easier and tastier than a shop bought sauce. Could use an onion if you have one. I find it's plenty of sauce for a 500g bag of pasta. Now, we could eat a 500g bag of pasta between two people 😅but you can easily get another 4-5 decent bowls out of that using ingredients you've already bought. Add a garlic baguette to pad it out, bit of cheese.
All of that, if you added a baguette, grated cheese, bag of pasta, is about £6/7 and would do 4 decent, adult sized lunch or dinner portions for 3 days. So 12 meals, for 50/60p?
If you search tiktok for meals for a fiver, there's a guy on there (Mitch, maybe) who does recipes with ingredients and step by step videos, all of them for £5 or less.
You could cut your food bill considerably, although granted it may not work with different dietary requirements and tastes.