We only spend £30-35 a week for both of us on food, thats 3 meals a day and snacks. This is what I do.
Personally I would buy some little plastic tupperware tubs in asda, they would hold enough yoghurt for a child sized portion for lunch and then they wouldnt know what brand it was. It would be better for the enviorment too if you bought one large tub of yoghurt and used that.
I use sains basic bio powder, basic cleaners all round in fact. I only use fabric softner on sheets and delicates. We live in a hardwater area and I havent noticed a difference. I only use 3 tablespoons of powder per wash, I use washing up liquid as stain remover for coloureds and bleach sprayed on for whites. Things like colour catchers, whitener and colour run remover I use homebargains for. Their own brand colour catchers are really cheap and work as well as Dylon ones.
For delicate washes I use Alur from homebargains, only 89p a bottle compared to woolite at £4!.
I use mainly frozen basic vegetables from asda or sainsburys. Much less waste.
Aldi meat is actually really good, I am currently addicted to a rectangular italian salami. We have the frozen roasts too, the gammon one is fab. I havent tried the pork as it has cows milk in and I have an allergy to it.
For potatoes I use a local farm shop, 5kg of Wilja pots are 60p. They taste better than supermarket ones too. I have to wash them but it's not great hardship. All potatoes came like that when I was little.
If you want branded stuff I second Homebargains, or the pound shop. They do tuna, anti pasti stuff is only a £1 a jar and it tastes great. B&M is a similar chain but I dont have one near by.
Have you tried sains basic tea bags? they taste really nice, we have had them for the past 15 months and DH hasnt noticed at all. I bought 15 boxes for £4.50ish and they will last me pretty much all year. We used to have PG Tips from Costco but I decided I wasnt paying a penny a bag for tea.
I use tesco daisy powder for the dishwasher, one tablespoon per cycle gets everything clean and the whole box should last me a whole year. I use pound shop rinse aid as it has the same active ingredients as Finish.
I think with the basics ranges it really is a matter of trail and error. I prefer sains basic pasta to asda purely because it is made from 100% duram wheat. dont like the pasta sauce but aldi passata is so cheap and with a few herbs from homebargains thrown in you would not know the difference. I have smartprice soya milk now because Aldi put theirs up by 6p and again I cant tell a difference.
If you have a farm foods near they do 8 pints of milk for £1.80. You can freeze milk too.
It's all about shopping around and seeing whats out there, I dont mind going in to town every so often and bulk buying whatever I need. Parking in the free 30 minute on-road parking of course.
If you live in a hard water area try using vinegar as a kettle descaler, you pour it in cold, leave it overnight and decant it back in the next morning. I use the smartprice one and descale 2-3 times a week.