Fairy tales, it is argued, all consist of a combination of just 31 sequential elements; between the 'once upon a time' and the 'happily ever after', nothing ever takes place when it shouldn't. In his speech to the Conservative Party Conference yesterday, David Cameron gave the impression that he thinks life works in much the same way, telling under-25s to: "Go to school. Go to college. Do an apprenticeship. Get a job."