Icebergs in the Thames

I am curious that my local water company's most recent plan to cope with water shortages is to bring icebergs into the Thames. Surely this whole global warming thing means that there won't be any icebergs... and even if there are then should we really be dragging the few remaining ones away from the poor seals, penguins and polar bears that need them themselves. Sounds like a silly idea to me, but at least ideas like that help me understand how Thames Water got us into this mess in the first place.