In this talk, Paul Cairney (University of Stirling) explores whether comparisons over time on COVID-19 policymaking are as valuable as comparing political systems. 'The UK Government’s COVID-19 Policy Advisory System. What did "Guided by the Science" mean over time?' research seminar was organised by the Crisis of experts knowledge and authority interdisciplinary research cluster (check our website for more details https://www.eui.eu/en/projects/expert... ).