When we had to tighten our belts a bit I thought back to the foods we ate when I was a kid, I NEVER felt like we were on a tight budget or deprived but we definitely ate cheaper.
It was completely normal for 1 evening meal a week to be something on toast, there were 2 adults and 3 kids with usually a couple of friends over. A whole loaf of bread for toast then a tin of beans, a tin of tomatoes and a jug of scrambled eggs in the middle of the table, everyone help themselves. So 7 people fed for about £4.
Baked potatoes with grated cheese and salad
A big pack of spare ribs or chicken drumsticks baked in the oven with jacket potatoes and coleslaw or cottage cheese.
Sausages - either hotdogs, toad in the hole or in a big deep sided tin with small chunks of potato, peppers, onion and tomato all baked together.
A fry up - bacon done in the grill or on trays in the oven for 20-25 mins at gas 6. Mushrooms, loads of these as cheap and filling, fried eggs 1 each, tinned tomatoes, beans, toast or fried bread. A really cheap meal, mostly veg, if you do scrambled egg you can cook the lot with only spray oil so not unhealthy but feels comforting.
Roast dinner can be a really cheap meal and great for leftovers. A chicken is probably the cheapest and best piece of meat, you get some leftover meat for a chicken and mushroom pie or stir fry the next day. Then potatoes, carrots, broccoli, cauliflower, packet stuffing, Yorkshire puds all cheap and filling. Leftovers become bubble and squeak.
Make desserts so you don't feel like you're missing out on treats, pies, crumbles, cobblers all cheap and easy to make and in a few months if you go scrumping down country lanes you can fill your freezer with free blackberries. Buy fruit in the reduced section of the supermarket, chop into chunks and freeze in a mixed fruit bag. Then just chuck a couple of handfuls still frozen into a dish and cover with crumble mix for a really quick pudding. Or blitz the frozen fruit with a little fruit juice or milk for a fresh smoothie.