Andrew, you're right about Corona!
My worry is mostly regarding how big chains can be fooled; the corner shops that feature in this seem to be dodgy all round.
Tescos say it's down to their distributor and they wont take responsibility but the serious issue here is health and the conditions that the fake beer was brewed in.
When you go into a main street supermarket the last thing you expect is that the products they sell will be counterfeit but that's whats occurring.
As an aside, there was a doc on BBC4 last week about the Gomorrah and how they are usurping legitimate craft cheese makers in Napoli with counterfeit dairy products!!