The interaction of medicine and the common law is best understood through an examination of the epistemic properties shared (or taken to be shared) by both disciplines. One such property is represented in the ideal of evolutionary progress through a conflict of ideas, as developed in the work of Karl Popper on science and politics. This ideal also provides an orientation for judicial and theoretical reflections on the role of the dissenting judge in the development of the common law. It can be linked furthermore with broader ideologies of progress that valorize liberal political and economic arrangements. The medical negligence jurisprudence of the English courts has until recently been structured by an understanding that medicine, as a science, participates in this dynamic of progress. Consequently, the protection of medical pluralism from close judicial scrutiny has been taken to be a matter of public interest. However, this weak liability regime is now threatened by increased judicial activism, regulatory intervention and patient consumerism. The latter are in turn underpinned by a series of fundamental critiques directed at the idea of progress in medicine and science.