[citricsquid]

Tesco frequently has attendants monitoring the self service checkouts; if someone sees that your items are going through for £0.01 (the prices are displayed on the monitoring screen that the attendant can see) you're probably going to have a bad time (banned from the store at the very least).

Not worth it...

[liedra]

Once again, depends where you go. I've been in supermarkets where the self checkout registers mess up so frequently that the attendants basically rush over, swipe their card, whack something on the keypad, then disappear to the next red flashing light. They rarely check anything!

[Kudos]

Don't discount it to £0.01, that is just stupid. The obvious scam here is to take high value items and mark them down dramatically. For example, marking a £200 phone down to £20.

Not that I approve of this...

[bonzoesc]

The less obvious and more ethical thing to do is to buy two identical products, one for 10p more and one for 10p less.

[dangrossman]

Wouldn't it be more ethical to just scan the item without buying it?