Pick up cheap/reduced veg to make soups
Make a huge batch of tomato sauce with value tinned toms, onion, cheap passers, garlic dried herbs and some tomato purée. Freeze in batches and you can heat it in the microwave.
Make bolognese and bulk out with grated carrot or parsnip, freeze some for another time - a pack of mince and 1-2 carrots with some of aforementioned tomato sauce should make enough for at least 4 meals for the two of you.
Make some of the bolognese into lasagne with value pasta sheets. Make the sauce with spread and flour and half milk and half veg stock (value stock cubes are cheap and you'll be needing them for soup anyway). Season the sauce well with black pepper and you won't tell the difference.
Add value kidney beans and some spice to the bolognese to make chilli and serve with rice.
You can use the grated veg trick and mince in a savoury gravy to make cottage pie - add frozen veg to the mince to make it go even further and top with mash and a smattering of cheese. Again, freeze leftovers. Or serve the mince with boiled or tinned potatoes as scouse.
Block of mature cheddar, more flavour so you can get away with using less, grate it yourself, use for sandwiches etc as well.
Tuna pasta - pasta, tinned tuna flakes, half mayo half value plain yoghurt. Add frozen peas/mixed veg/sweet corn to the pasta as it cooks.
Cook some plain rice, add frozen mixed veg near the end, drain, put in a frying pan with oil, swirl in a beaten egg or two, egg fried rice. Perfectly acceptable cheap tea.
Value plain yoghurt and frozen berries for the little one.
Jack monroes trick of using salmon paste as a stir in pasta sauce is far tastier than you'd expect.
Defrosted frozen or tinned veg and some drained tinned potatoes baked with beaten eggs, season well with pepper and dried herbs and you have a frittata. I sometimes serve this with a bit of the home made tomato sauce on top.
Aldi super six offers for fresh fruit - think they have grapes, apples and pears right now.
Chicken thigh fillets are cheaper than breast, a pack of those and some root veg in a chicken gravy with some herbs makes a nice stew that should feed you both for at least 2 meals. Add potatoes to the stew for a complete meal or gave it with mash or plain boiled rice.