This chapter talks about Sir Ivor Jennings, who observed in the context of decolonization in the 1950s that one must first decide who are the people before one can decide how the people are to govern themselves. It proposes a constitutional renewal project that must recognize the United Kingdom as a complex 'Union state' made up of distinct nations. It also describes the United Kingdom as a messy amalgam of two kingdoms, a principality, and a dismembered province that were forged together by civil wars, bribery, and dynastic wrangling. The chapter looks at the geographical, cultural, historical, and demographic complexity of the polity being constituted that will determine much of its constitutional architecture even when fairly standard Westminster Model constitutionalism is applied. It illustrates India and Bangladesh, two countries whose constitutions are thoroughly Westminster influenced but show different design because of the demands of context.