As a first case study, the book discusses the United Kingdom (UK). The reason to start the analysis with this country is because it is the only unitary state in the sample and is therefore different from the other four countries. It allows to extend the test of the argument beyond federal states. As discussed in the previous section, the empirical expectations that follow from the argument for the UK regarding the coupling of the health care and public health sectors are the following: on the one hand, professionalism is high and institutions of interest intermediation are pluralist, which means that there should be responsiveness between the two sectors. On the other hand, due to the unitary government and few veto points, both sectors should be institutionally integrated. This chapter analyzes the coevolution of health care and public health in the UK by discussing the historical development of both sectors’ relationships in the four defined time spans. The results show that health care and public health coevolved from non-coupling to tight coupling. The analysis shows that unified government was the driving force behind the- ses reforms whereas interactions between professions was less important – although the theoretical priors led me to expect professional discourse coalitions to be important.