I've got super top secret tip.I am alittle maverick but I have a system to help me budget. Shall I share it children.
It's called going to the cash machine and lifting ££ of my budget from it at the supermarket ( as many of them now have this service) and taking it safely deposited in my purse into the shop getting a handheld scanner and shopping to that budget. Paying over the cash at till and leaving the shop.
Sorry, it's probably so out there I may need to spoiler this post.
When I go to a supermarket I take some bags, just in case I decide to buy some stuff. And, this is the good bit, I put the stuff I have bought in the bags. Hashtag game changer.