Britain’s governance crisis is increasingly structural rather than political. Weak economic growth, rising public expectations, migration pressures, regional inequality, and declining institutional trust are converging to strain the post-war British governing model. Prime Minister Keir Starmer inherits a system facing fiscal constraints while still expected to sustain global influence, expansive public services, and domestic stability. Brexit accelerated deeper fractures around identity and sovereignty, leaving the UK in a prolonged era of political volatility where governments struggle not only to govern effectively, but to govern credibly.