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So I occasionally get these marketing emails from Tesco. I’m sure I’ve tried to unsubscribe before, but they just keep coming. The “unsubscribe” link takes you to this page.

I can’t help thinking that there might be a teeny flaw in their system there.

Can you tell what it is?

[Clue: In case you haven’t got it yet, why not try typing (say) “” into the box that says “Existing Customers Sign In Here”. He wasn’t previously receiving all their marketing emails, but he is now…]