First big shop of the year this morning. New Year rezzo was to ditch Tesco big shop as they were getting silly on prices. Hence, to Aldi. Still had to pop in to Tesco for some bits that Aldi don't sell ( Dentastix for doggies and Sensodyne for me) . Guesstimate on Aldi v Tesco is that I've saved £57 today. Pretty pleased.
From that, I'd hazard a guess you've been buying branded stuff in Tesco.
(I may be way off the mark here, but apologies if I am.)
When you compare like for like e.g. Aldi & Lidl to Tesco's own brand, they're pretty much of a muchness on price. Though you do need to check pack sizes and price per unit weight as Aldi & Lidl tend to have smaller packs of things which gives a false illusion of cheapness. And watch out for the real clunkers hiding among the everyday items. I've had a fair few in my time.
Can't say much about Aldi as I don't go in there on a regular basis - Lidl works out better for me. But where Lidl scores really well is on their continental deli (cured meats, cheeses) and on things like kitchen roll, toilet roll (they do packs of 24 cushelle for £8), rice cakes, baking staples (brown sugar, dessert chocolate, dried fruit), canned veg, set honey, peanut butter and some of their yoghurts and desserts. I go every couple of months and stock up as the nearest Lidl to me is a 40 mile round trip.
For everyday items, I've found that Tesco own brand can be better than the big brand by some margin. I rarely buy branded stuff - most of what I do buy is food and treats for the cats.
Managed to resist and keep my hands in my pockets.
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I have haricot beans though. They'll go nicely with peas, green beans, cauliflower, broccoli and baby tatties. 
) are chicken livers. Equally good pan fried with bacon and kidneys, or braised with loads of onions. And served with mashed tatties. 
