Baked potatoes with cheese and beans,
Chicken legs roasted or casseroled/curried (whole legs can be bought at larger supermarkets - lots of meat on them and cheaper than filleted thighs or chicken breasts) - cook them in your preferred way with a spice rub or in a curry or casserole and serve with rice, veg and/or potatoes. A jar of supermarket curry sauce is less than £1 or make your own using curry powder if you have it, plus a tin of tomatoes or coconut milk.
Macaroni cheese. Cheaper to make your own cheese sauce if you have flour, butter and cheese in. If not, look for a cheap jar of white sauce (béchamel) for lasagne- use that and add a handful of cheese.
Omelettes and salad. Serve with bread.
Two bean vegetarian chilli, include tinned tomatoes and a whole pepper and an onion. Serve with rice.
Mushroom stroganoff, including a pepper and an onion. This is cheap if you have a jar of mustard and/or paprika in your store cupboard. A small tub of sour cream is good to add in (only need half of a small tub, save the rest to have with the chilli above) and should cost 70p or so. Serve with rice.
Sausage, mash, peas and onion gravy.
Pork chops, potatoes, carrots and peas with gravy. (Pork is very cheap, buy a big pack of cheapest chops you can find and freeze half).
Frozen pizza (supermarket own unbranded). Two pizzas between 3/4 people is fine if you’ve all eaten in the day and aren’t feeding ravenous teenagers! Add a garlic baguette (cheap, frozen one) if needs be.
Cauliflower and sweet potato curry and rice. Cook with a jar of korma sauce or curry powder and a tin of coconut milk.
Make sure you’ve got bread in for sandwiches and lunches with some ham, cheese or tins of beans, unbranded porridge oats for breakfast, milk in the fridge and apples and bananas in the fruit bowl. Your budget should cover this easily.