BR
Strictly speaking, Clearcast haven't banned it, because they don't have the power to ban ads - they've just expressed their opinion that it's likely to be in breach of the advertising code. If Iceland could persuade a broadcaster to run it, then they'd probably get a slap on the wrist from the ASA, and told not to run it again. (The Ryanair school of advertising, there)
In about six months time. They know they got much more publicity from it being "banned".
A bit of context might be good here. The Iceland ad has been banned by Clearcast because it is deemed too political to run in a standard ad slot.
Strictly speaking, Clearcast haven't banned it, because they don't have the power to ban ads - they've just expressed their opinion that it's likely to be in breach of the advertising code. If Iceland could persuade a broadcaster to run it, then they'd probably get a slap on the wrist from the ASA, and told not to run it again. (The Ryanair school of advertising, there)
In about six months time. They know they got much more publicity from it being "banned".