I spend between £30-40 per week for me, two primary aged DCs and 3 cats....the cats cost the most!
All three of us eat cooked lunch and pudding at school, 1 cd also has breakfast at school....so I'm buying for 21 dinners, 6 lunches and 16 breakfasts......we tend to have simple suppers due to cooked lunches.....so beans on toast, noodles, cheese, apple and crackers, yoghurts, eggs (we have hens) that type of thing. Breakfast is toast and/or cereal. Meals at the weekend tend to be cooked breakfast...eggs again/bacon etc...or pancakes, pizza or suchlike in the evening. Lunch might be something with pasta and then a full roast (sometimes at my parents) on Sunday. I feel we eat well, kids snack a little but usually on cheap nuts, seeds, fruit, yoghurt and biscuits. I don't drink much and don't smoke.
Cats food - buy tins in Lidl and dry food that is on offer.
I use vouchers where appropriate, bulk buy and use value products if I feel the quality is good (noodles, pasta, cheese, veg)