bread flour in Aldi was something like 60p for 1.5kg last time I looked (last month)
I usually buy 2 or 3 bags and then we have a fresh loaf on Saturday mornings.
We are 2 adults, 2 dc with another one on the way, plus a large dog
We shop at Aldi a lot, and we run on roughly £75-£80 for a 2 weeks bulk shop, and top up in between on fruit, bread and milk as needed. Some weeks it's a bit more, some weeks a bit less, depends on needing toiletries, washing powder etc. We have meat pretty much every day, but then I cook large meals which go over 2 days sometimes (lasagne, macaroni cheese with a layer of mince at the bottom)
Dog food we bulk-buy from a local wholesaler, £18 for 15kgs - feeds my Dal for about 6 weeks at a time.
I make all my own pasta sauces; use a carton of passata, shred an onion, a bit of celery, and a good pile of mushrooms in a food processor. I also lob in 2 or 3 carrots to help bulk it out. This with a 450g of mince makes enough to feed us all for a bolognase, and there's usually enough left over that I can use for lunch the next day for me/DD. It's a good basic sauce which can be flipped from bolognase to chilli very easily!
Aldi's frozen chicken is good to use, especially if you buy the big bags of breast fillets - I fry 2 or 3 off as needed and snip them into strips for curries and stir-fry. I can make one bag last 2 meals like that.
Tuna pasta is also a god-send! Approx 100g of (uncooked) pasta per person, a tablespoon of mayo per tin of tuna used, and one tin per 2 people. Cook pasta, throw it all together when cooked, and add pepper to taste :)
On a last note, if you can find a FarmFoods near you, they are brilliant for bulk buying, especially their frozen veg.