Prompted by the events following the 2016 referendum on EU membership and written during the COVID-19 pandemic by one of the leading public lawyers of our day, this book considers two key constitutional principles, the rule of law and separation of powers, by examining the generality, certainty and predictability of law, relations between the different branches of the state, and the mechanisms of accountability within our democracy. Since the referendum and in the light of the restrictions imposed to deal with the pandemic, and the use of guidelines presented as rules to do so, attention has refocused on the relationship and respective powers and competences of the three branches of the state, the legislature, the executive, and the judiciary. They have also placed strains on our unwritten constitution that have been unknown in modern times. The role of the courts and of the rule of law, has been dramatically illustrated by recent litigation, most notably the decisions on whether