tomato and veg pasta:
peel and chop onion, garlic if you want, and corgette. fry in oil until soft. add tin value tomato sauce and a bit of tom puree and whatever other veg you've got, except mushrooms. add whatever seasoning you like, I just wallop in some dry basil and oregano. allow to simmer for a while, then whizz up in the blender. serve with pasta, homemade garlic bread and salad. I make a load and freeze it, then there's a quick easy meal ready to go whenever. it's also a great way of getting some veg into my kids.
french bread pizzas or pitta pizzas. drizzle with a bit of oil, put tomato puree on thinly, top with whatever you've got then some cheese. grill.
I used to buy organic meat, and do still if it's on offer, but otherwise it's freedom food or if that's not available then free range. chicken breast is sooooo expensive! try and get into the habit of buying larger cuts and butchering it yourself.
Use eggs more! omelette, pancakes, spanish omelette, a big salad with hard boiled eggs, new potatoes, mozarella (get value), sweetcorn, carrots, french bread.
jacket potatoes are a great meal, and stuff on toast is underrated imo - scrambled eggs and cheese, beans, mushroom and tomato. or tuna sweethcorn mayo (all value) with sliced cucumber in a toast sandwich.
pasta and cheese sauce. make a roux with butter flour and milk, add cheese, some squashed brocolli. if you're tired or hate making roux then use creme fraiche and cheese, melt slowly in a bowl over the cooking pasta. easy mcpeasy.
go to the supermarket in the evening or sunday afternoon and get the stuff that's on offer that's about to go out of date, then freeze it straight away and eat it whenever. This is probably not recommended in terms of sell by dates but I've been doing it forever and we're all still breathing.
I don't go to aldi as there isn't one near us, so I don't know how cheap it is compared to value ranges. I find sainsbury's basics and tesco value absolutely fine for almost everything, except meat.
Don't buy crisps and treats. I just don't have that kind of stuff in the house and we don't miss it. You could make cheese straws or similar for snacks if you want. We quite often have bread and butter as a snack, which sounds a bit WWII but it works for us. If it's not in the house you can't eat it, and they're so full of crap. Make your own cakes or muffins - value flour and butter are fine for general cooking. you can put fruit in that's going off, ie bananas, apples to minimise waste.
Counter ham - really? it's so pricey! either buy packet ham or don't buy it at all. switch to cheese or cook your own cheap meat and use it. It's much cheaper to buy a ham, slow cook it and then slice that up.
Organic yoghurt seems an indulgence to me. just get supermarket own or even basics. we get basics fromage frais for the kids for a pudding, it's not got more sugar than the more expensive one, and only a little bit less fruit.
Sunday lunch: It's lovely that you have a big family lunch every week but I can imagine it's expensive! If you can't just tell them you're broke and can't afford to feed them every week, or don't want to, then how about:
lasagne
cottage pie
a roast chicken or even cheaper a slow cooked gammon but with sainsbury's basics onion chutney, basics mayo, basics coleslaw, basics pot salad (you get the idea) and basics baguettes - the part baked ones are great and about 40p for 2 I think, a big salad to fill them up made with value peppers, onions and lettuce and mozarella.
huge pasta dish (value salmon? i think sainsbury's is fairly ethical but cheap) and salad, garlic bread made with cheap part baked baguettes.
Home made pud (LOVE the sponge pudding recipe above!) Value fizzy drinks.
Buy value floor cleaner, it's fine, I use it. Or just get a big bottle of cheap bleach and use that for floors, toilets, surfaces, diluted as necessary. Or just washing up liquid (ditto value is absolutely fine), although I found this left the floor a bit sticky!
Buy value baby wipes - asda smart price are great, as are asda pull up nappies, much better than pampers and about £3 for 20 I think. Again I've heard aldi ones are good and cheap but I don't know about aldi.
sofa wipes? I don't know what these are, but I use baby wipes to get smoosh off our leather sofas and they're ok, although they are very old so I'm not too bothered about caring too much for them.
Fresh herbs are a real luxury! Either grow your own or use dried. I always use dried and they are absolutely fine.
You seem to use a lot of things for 'every day' that I would save for 'best'. ie nice meat, tuna steaks, fresh fruit juice. Try and get into the habit of eating more basic food day to day and then once a week having something posher.
fabric conditioner is a waste of money.
you could just try switching down. buy everything 1 level cheaper than you do now, ie switch from branded to supermarket own, or from supermarket own to value. you probably won't notice the difference.
To be honest you could solve a lot of your problems by changing your meat eating habits.
sorry I've gone on so much. good luck!