B.O.G.O.F No, that isn’t a variant on the ‘Go forth and multiply’ imprecation that has occasionally been heard to pass from my lips. It is the acronym so beloved of supermarkets and any number of retail outlets that call to us with their siren’s song of, ‘Buy one, get one free’. It always seems such a great offer until one gets home and wonders just what exactly you are going to do with 16 hot...