Do the management of Iceland stores know the difference between “half price” and “buy two get one free”?

We ask because their Norwich store was recently promoting a three-pack of cans of beer (one of the original four had been taken) at “half price”, actually half the price of the four pack so really a “buy two get one free” offer.

When the misleading labelling was pointed out to store staff their response was that they were acting on instructions from their head office marketing department, and that “Everybody does it”.

Wonder if this is the same silly tosh they give trading standards officers?