This article considers the salient arguments of John Finnis, Philip Soper, Michael Detmold, and Deryck Beyleveld and Roger Brownsword, all of whom published important works on jurisprudence in the 1980s. Their theories challenge the prevalent Legal Positivist assumption that law and morality are logically separate. Some argue that a connection exits between the two in the purpose of law; others in its procedural aspects. Drawing on the insights of Aristotle, Aquinas and Kant, amongst others, these writers have revived and redefined the hitherto moribund tradition of Natural Law theorising.