Buy a big chicken (although has to be cornfed) and use if for a roast meal one night, sandwiches for the next day lunches and a pie for the next evening.
Or even better - buy a big chicken.
Day one - roast it, pick all the 'spare' bits off, following day use some for chicken burritos (tortillas), the next use some for chicken pie, and then make a stock from the carcass to make soup with
Lots of meal planning, beans and pulses go a long way, as do lots of fruit and vegetables to 'bulk' out meals.
Instead of multiple loafs of bread for sandwiches for lunch every day, I buy baking potatoes for me and DH (when he's home) and a loaf of bread then 'stretches' further as it's only the boys eating it.
Look for the BOGOF's, 3 for 2, special offers on things. One week you may end up spending 'over' your budget - but the chances are you'll 'save' it over the next few.
Buy the big packs of meat, split it up before you freeze into meal size portions.
Those bigger packs of washing powder and dishwasher tablets do look very expensive, but it works out cheaper than buy a small one every week (have a look at how much they cost per kg or whatever it's 'measured' in!!).
If you can't get to the market, buy loose vegetables at the supermarket, requires a 'little' more effort - but then you don't pay extra for 'pre-packed' stuff.
If you like things such as coleslaw, either buy the raw ingredients and dice them up yourselve, add mayo and dash of vingager (or if you don't eat a lot the prepacked coleslaw mix is a good buy - again just add mayo and vinegar).
If you 'can't' resist having crisps, chocolates, sweets, etc during the week to munch on - buy the multipacks at the supermarket in your shop (again it'll 'add' to the shop price - but you'll save money as it's cheaper than buying singles at the local shop everytime you want one).
Right MUST sleep - now (and I'll probably think of lots more once I'm in bed LMAO) as I've got to be up and out early in the morning!!