Well there's a new reason never to shop at Target. He may have "modernised and advanced Tesco's IT" with things like "scan-as-you-shop" but that just proves he knows fuck all about Information Security.
Clubcard is so full of holes it's untrue (Google "Tesco Troy Hunt"), and all the PCs in store have the same password. OK, it varies from store to store. Its the store number. Which is printed on the receipt! Now I'll agree he didn't configure them personally. But he set the IT Security Policy (which is available online at https://zone.ocset.net)