Okay, somebody asked for a list so I have gone to my 'shopping list' area on my online shop (apparently doing online shopping on average means we spend 20% less than in store) and have the following written down - and have tried to bulk it into meals so you get an idea of what we have - although my main problem is our portion size. Neither DH nor I are overweight (well, he def. isn't, I've just had DC#3 and could certainly do with eating less to lose weight but I'm breastfeeding and runnign around after my two pre-schoolers too, so am justifying myself that way!). Either way, I saw a previous poster saying she made 12 adult portions of bolognaise with 1kg of mince. We get through a 500g bolognaise in one sitting, with perhaps a small portion left over for one person!!! 
We always eat a hot evening meal, and normally have cold lunch. I have a three-week rotational menu which we stick to (unless there is a special occasion or something), which has a roast, a further two or three meat meals per week, a couple of easies (eggy bread for example) and a 'tasty for everyone' meal (saussies, beans and chips/curry/homemade pizza etc). We get through more fruit than all the fruit bats in Sydney Botanical Gardens thought which, despite offers, is expensive. It's a shame that a pack of biscuits would be a (financially-speaking) better snack for the kiddies.
staples, breakfasts and lunches;
8pts milk, basics cheddar, camembert, basics clementines, diet coke (my vice, but I don't really drink alcohol), toms, cucumbers, bread, butter, breadsticks, basics cream cheese, pears, peaches, bananas, greek yogurt, 4-pack longlife orange juice, tea bags basics, peanut butter, cheepios (what we call cheerios - sainsbury's brand)
evening meals;
mccain oven fries
, baked beans, sausages
fresh cream, free range eggs, bacon
pasta/macaroni/pasta shells, basics chopped toms, mince, kidney beans, carrots, paprika
basics mozzarella, garlic, ham, plain flour, pineapple chunks
whole chicken, basics baking potatoes, vegetables
noodles
randoms:
persil non-biological, dishwasher salt, sainsbury's shower gel, rosemary, plughole unblocker, tissues, little ones wipes, Go-Cat, bleach
Our average spend is about £80 with one or two of the 'randoms' normally. I tend to buy these kinds of things when they're on offer and just hide them somewhere till we need them again...,