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The supermarket is Morrison's, where I like to shop. I've never seen bananas wrapped like that, they normally sell them loose, in bunches, with a little plastic hook through them that has the price on. How wasteful to wrap them individually, and how ironic, bearing in mind Morrison's has a publicity drive in stores to encourage people to re-use bags and save packaging.
That is utterly ridiculous, but I'm not surprised. Despite all their rhetoric Morrison's is still the only supermarket in which I've seen shrink-wrapped heads of broccoli (as in, the only broccoli available is wrapped) and it is rare to find any veges that aren't pre-packed (but I only want 1 carrot, not 500g! Tough).