To be fair, I'm not looking to make huge savings. £150 odd for the week is fine - we can afford it and I've got it down - it had crept up to around £200 a week which was definitely too much. It just makes me cross when I read endless articles or watch tv programmes saying, "feed your family of 4 for £1 each" but that doesn't take into account the OTHER costs.
we basically have 3 meals a day here for 4 people.
Breakfast: cereal / toast / eggs / pancakes, juice in the morning - so that's milk, cereal, eggs, flour, bread, juice etc all needed.
Lunch boxes: sandwiches, fruit, yoghurt pot, possibly a small biscuit or rice cake - so that's all those ingredients too.
Drinks: tea, coffee, milk and oat milk, occasionally juice or squash. As a treat, hot chocolate once or twice a week. Wine for me! 
Snacks: I bake our own snack bar type things, rice cakes, this weak I'm trying some toasted chickpeas, more cereal (for the kids), bread, sometimes jacket potatoes/bagels, fruit etc.
Non-food things we need and shop for constantly: tinfoil/clingwrap, bin bags, compost bags, oils, vinegar, flavourings, cleaning materials, condiments, basic baking ingredients etc etc.
This is all BEFORE the spaghetti bolognaise ingredients or the vegetable curry ingredients for dinner.