Chicken thighs instead of breast. Buy them with the bone in, save the bones in the freezer for bone broth and it's cheaper.
Eggs for frittata, scrambled, omelette, boiled, egg fried rice.
Deli counter, you can buy off cuts of some hams really cheaply. They're chunky and misshapen, great for sandwiches, omelette, ham and egg, jacket potato filling.
Tinned tuna, pasta bake, jacket spud filling, salad.
If you can, buy your well used basics as large as you can. Works out cheaper.
Frozen fruit and veg.
Catfood tins, not pouches. If you're on housing benefit or council tax benefit, register the cat with the PDSA.
Meal plan! Saves time and money.
I hope all the ideas help you. It's rubbish stressing about money and how to feed your family 