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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) “terry.leahy@tesco.com” into the box that says “Existing Customers Sign In Here”. He…