How do crises change prime ministerial power?
Crises are the moments when prime ministerial power is most visible — and most volatile. The same event can concentrate authority at the centre and then expose the leader to sustained blame. Whether a crisis strengthens or weakens a Prime Minister is rarely determined by the crisis itself.
- Crises often centralise decision-making, increase demand for visible leadership and allow rapid agenda control.
- The same crisis can expose weak preparation, poor coordination, legal limits, implementation failure or misleading communication.
- The rally effect is a possibility, not a rule: any rise in support is often temporary and depends on the type of crisis.
- Outcomes depend on perceived competence, attributed responsibility, duration, cost, party unity and the availability of a credible alternative leader.
Why crises can strengthen a Prime Minister
- Centralisation. Emergencies concentrate decision-making in Number 10, the Cabinet Office and small ministerial committees, reducing the number of actors who must be persuaded.
- Demand for leadership. The public, media and Parliament expect the Prime Minister to lead visibly, giving the leader a platform others cannot match.
- Agenda control. A crisis clears the agenda. Contested policies can be accelerated or quietly dropped under cover of the emergency.
- Suspension of normal politics. Internal critics who attack during an emergency risk appearing unpatriotic or self-serving, so dissent is temporarily suppressed.
Why the same crisis can weaken them
- Preparation is scrutinised. Attention turns quickly to whether the government should have anticipated the problem.
- Coordination failures become visible. Emergencies test the machinery of government, and failures are highly public.
- Legal limits bind. Emergency action must still rest on lawful authority, and governments can be challenged when it does not.
- Implementation is judged. Announcements are compared against delivery in real time.
- Communication carries risk. Statements that later prove inaccurate become long-running political liabilities.
The rally effect — use with caution
The idea of a rally effect describes a temporary increase in support for a leader or government during an external emergency. It is a documented tendency in some cases, not a guaranteed mechanism. Where it occurs it is usually short-lived, and it can be followed by a sharper decline if the crisis is prolonged or handled badly.
External crises and self-inflicted ones
The distinction matters a great deal.
| External crisis | Government-generated scandal | |
|---|---|---|
| Examples | Security threats, natural disasters, pandemics, global economic shocks | Misconduct, misleading statements, cover-ups, ethical breaches |
| Initial public response | Often a demand for leadership; sometimes a temporary rally | Immediate attribution of blame to the government |
| Main risk to the PM | Being judged incompetent or unprepared | Being judged personally responsible or untrustworthy |
| Effect on party | May unify around the leader, at least initially | Tends to divide the party and invite leadership speculation |
What determines the outcome
Six factors do most of the work:
- Perceived competence in the response;
- Attributed responsibility — did the government cause it, fail to prevent it, or simply inherit it?
- Duration — long crises exhaust goodwill;
- Costs borne by the public, economically and personally;
- Party unity during and after the event;
- Credible alternatives — leaders are far more secure when there is no obvious successor.
Comparative cases
Margaret Thatcher and the Falklands conflict (1982). Commonly cited as a case where a successful response to an external crisis coincided with a significant recovery in government standing. Historians and political scientists continue to debate how much of the subsequent 1983 election result is attributable to the conflict as opposed to economic recovery and opposition divisions.
Tony Blair and Iraq (2003). A decisive exercise of prime ministerial authority that was followed by lasting damage to the leader’s reputation, illustrating that acting decisively is not the same as strengthening one’s position.
Government authority during the Covid-19 pandemic. The pandemic produced an extraordinary concentration of executive decision-making, followed by sustained scrutiny of preparation, procurement, communication and compliance with the rules the government itself set.
Treat causal claims in all three cases as contested interpretations and cite reputable evidence rather than asserting a single explanation.
A balanced conclusion
Crises do not have an inherent political direction. They redistribute attention and responsibility towards the Prime Minister, which is an opportunity and an exposure at the same time.
In The First 100 Days
The random crisis events exist to demonstrate two things: uncertainty, because leaders cannot choose the problems they face, and path dependency, because your earlier decisions shape the options available when a crisis arrives.
The events do not carry real-world probabilities, and the outcomes attached to each response do not establish that one approach is universally correct.
Related explainers
About this explainer
This page explains how prime ministerial power works in the UK. tutor2u uses primary and independent sources including the Cabinet Manual, the Ministerial Code, UK Parliament and the House of Commons Library, legislation.gov.uk, UK Supreme Court judgments and the Institute for Government.
The First 100 Days is a fictional educational simulation. Its decisions, crises and numerical scores simplify complex political relationships for learning purposes. They are not a scientific measure of prime ministerial performance.
Last reviewed: 2 September 2026
Primary sources:
Cabinet Manual ·
Ministerial Code ·
UK Parliament ·
House of Commons Library ·
legislation.gov.uk ·
Institute for Government