I agree with Mandy too - I think people sometimes think a massive portion of meat in some way equates to eating well.
I'll buy a 740g pack of mince and get two family meals from that
I won't mention the famous MN Aldi chicken 
I don't buy 7 x 'meats' - I know there will be a 'pick and run' night at least once a week and then quite feasibly we'll not eat in another night (say once in 6 weeks we go to the in-laws, once in every couple of months we'll have a pub meal out, about once a month we'll have some kind of take away, maybe there's a birthday meal or function from work or something).
I generally allow one meal to be something like jacket potatoes, or what my kids call 'camp pasta' (just pasta, a tomatoey sauce and grated cheese or throw in bits of ham or bacon sometimes).
I do tend to buy stuff that's on offer - I don't agree with strict meal planning, I'll buy what's best value when I get there (best before dates allowing), and will buy fruit and veg that is either in the 'Super6' at Aldi, or at least seasonal.
I rarely buy cake - my dcs all like making cake, but you get a lot better vfm from home made cakes.
I do eat leftovers - lunch the next day or maybe in the freezer.
I also stockpile things if they are on offer....eg, we quite like the 'Chicken tonight' sauces in a jar, but they've gone up to nearly £2 so I won't buy them, but then I came across some on offer at £1, so I bought about 12
- I know they will keep, and I don't mind paying that for them.
I use 'Nicky' toilet roll - £3.95 for 18 rolls and it's lovely and thick - can't believe what some people pay for toilet roll 