It does work but the issue is convincing the shop that you're not stealing all of their stuff as you wander around putting it in your bag.
It's waitrose - they let you do that now. There's an app you use...
It only half feels like stealing, but if you are anything like me and you've eaten half the shop before you get to the checkout then you won't be put off.
@Howard started
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It does work but the issue is convincing the shop that you're not stealing all of their stuff as you wander around putting it in your bag.