I'm afraid I've probably been that shop assistant, it's very easy to get so tuned in to the logic of your branch's layout that you forget that it's not necessarily obvious to the rest of the world.

I must admit my first thought was with the carpets, oh, they don't do carpets, maybe with the flooring then, but whether that's the result of nearly twenty years of retail brainwashing or sheer blind luck I don't know.