A few tips about your grocery shopping:
We do the majority of our grocery shopping in Lidl, although there are a few items that are cheaper in Tesco/a local bulk-buy shop.(the large bag of tesco cat food is better value but cheaper than the equivelant weight of lidl bags)
There's a section in the frozen section of every lidl with 30% off frozen meat products. These items might be a few days off their sell by date but are always perfect.We buy as much as we can of these and keep them frozen until required.
Also in lidl there's a 30% off in the bread section, if it's cheaper than their cheaper bread, buy it and freeze.
I also find our local centra can be good value sometimes for meat. So when something's on offer we buy a few.
When we do our monthly shop we buy treats included. In our house, fruit juice is limited to 8 per month and when they're gone, they aren't replaced until next month.
We allow ourselves one 1.5 litre of fizzy drink per week.(a weekend treat!) and again, when it's gone it's gone.
If you can find the huge box of washing powder on offer get it. (It's the big box, can't remember the exact volume or price but it's around €13 and lasts us for months. Buy cheap fabric conditioner if you have to use it.
At the end of every month sit down and work out your meals by the week for the following month, eg:
Monday: Lasagne
Tuesday; potatoes, veg, sausages.
etc etc.
and buy everything you need for these meals at the beginning of the month. ( some fresh vegetables and fruit will have to be bought fresh but don't have to be expensive)
if you can buy monthly, when you get home, make a batch of stews or casseroles. And when you're making stew/casseroles bulk it out with cheaper vegetables like carrots or whatever's in season (cheap). When you're buying beef for stews it doesn't need to be the best cut. i use stewing beef and leave it to cook (on low temperature) for a couple of hours. The meat is always beautifully tender.
If you made enough frozen dinners for even two days per week you'll have two days off from making the dinner! maybe use that time to get to the cheaper shop once a week?
Sometimes i make homemade vegetable soup (packed with lovely vegetables) and we have it for dinner with crusty rolls. We love it and it's all good for you.
No doubt i've forgotten some ideas, will post if i think of them.