Prorogation and the Courts: When Parliament Was Suspended

In the autumn of 2019, the ordinary and largely procedural act of proroguing Parliament became the centre of a constitutional crisis — and the subject of a landmark judgment. The episode remains one of the clearest modern illustrations of the limits the courts can place on executive power.

What prorogation is

Prorogation is the formal ending of a parliamentary session. It is distinct from dissolution (which triggers a general election) and from recess (a break during which Parliament is not dissolved). During prorogation, Parliament does not sit, debates cease and most pending business falls. It is normally a routine step taken before a new session and its accompanying Queen’s or King’s Speech.

What happened in 2019

The controversy arose from the length and timing of a prorogation announced at a moment of acute deadlock over the terms of departure from the European Union. Critics argued that suspending Parliament for an extended period, at precisely the point when it might have legislated on the most pressing question facing the country, was not a routine reset of the legislative calendar but an attempt to sideline the legislature. Supporters maintained it was a lawful exercise of a long-standing prerogative power. The suspension drew unusually sharp language: opponents characterised it as shutting Parliament out of the central decision of the day, and protest under slogans to that effect spread quickly, while the government insisted the timing was ordinary and the session simply overdue for renewal.

The Supreme Court judgment

The dispute reached the Supreme Court, which ruled unanimously that the prorogation was unlawful. The reasoning turned on a principle rather than on motive: a prorogation will be unlawful if it has the effect of frustrating or preventing, without reasonable justification, Parliament’s ability to carry out its constitutional functions. Because the suspension in question had that effect and no adequate justification had been shown, the court held it was void — Parliament had not, in law, been prorogued at all, and could resume sitting.

The case and its aftermath

The litigation reached the court as two joined cases — one brought in England, the other in Scotland, where an earlier court had already found the suspension unlawful. An eleven-justice panel heard the appeal, an unusually large bench reserved for questions of constitutional importance, and delivered its unanimous judgment on 24 September 2019. The decision took effect at once: the Speaker recalled the Commons, and Parliament resumed sitting the following day as though the prorogation had never occurred. A step the government had presented as routine was undone within weeks, in public, by the courts.

Why it matters

The judgment is significant for reasons that outlast the immediate row:

• It confirmed that prerogative powers are justiciable — capable of being reviewed by the courts — even where they touch high politics.
• It articulated a clear functional test: the question is the effect on Parliament’s ability to do its job, not the government’s intentions.
• It reinforced the principle of parliamentary sovereignty by protecting Parliament’s capacity to sit and scrutinise.

At the same time, the judgment was carefully bounded. The court did not claim a general power to second-guess political decisions, and it stressed that most prorogations — being short and routine — raise no legal question at all. What it established was narrower but durable: that there is a limit, enforceable in law, beyond which the executive cannot use a procedural power to prevent Parliament from functioning. Where exactly that limit sits will be argued in future cases, but that it exists is no longer in doubt.

For students of the constitution, the episode is now a fixed reference point: a moment when the boundary between executive discretion and the rights of the legislature was tested in public and drawn by the highest court in the land.