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Royal prerogative in the United Kingdom

Privileges and immunities of the British monarch

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  • 5 chapters

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Through Authority and Court

Prerogative powers were formerly exercised by the monarch acting on their own initiative. Since the 19th century, by convention, the advice of the prime minister or the cabinet—who are then accountable to Parliament for the decision—has been required in order for the prerogative to be exercised. The monarch remains constitutionally empowered to exercise the royal prerogative against the advice of the prime minister or the cabinet, but in practice would likely only do so in emergencies or where existing precedent does not adequately apply to the circumstances in question.

Today, the royal prerogative is available in the conduct of the government of the United Kingdom, including foreign affairs, defence, and national security. The monarch has a significant constitutional weight in these and other matters, but limited freedom to act, because the exercise of the prerogative is conventionally in the hands of the prime minister and other ministers or other government officials.

Definition

The royal prerogative has been called "a notoriously difficult concept to define adequately", but whether a particular type of prerogative power exists is a matter of common law to be decided by the courts as the final arbiter. A prominent constitutional theorist, A. V. Dicey, proposed in the nineteenth century that:

The prerogative appears to be historically and as a matter of fact nothing else than the residue of discretionary or arbitrary authority which at any given time is legally left in the hands of the crown. The prerogative is the name of the remaining portion of the Crown's original authority ... Every act which the executive government can lawfully do without the authority of an Act of Parliament is done in virtue of the prerogative.

While many commentators follow the Diceyan view, there are constitutional lawyers who prefer the definition given by William Blackstone in the 1760s:

By the word prerogative we usually understand that special pre-eminence which the King hath, over and above all other persons, and out of the ordinary course of common law, in right of his regal dignity ... it can only be applied to those rights and capacities which the King enjoys alone, in contradiction to others, and not to those which he enjoys in common with any of his subjects.

Dicey's opinion that any action of governance by the monarch beyond statute is under the prerogative diverges from Blackstone's that the prerogative simply covers those actions that no other person or body in the United Kingdom can undertake, such as declaration of war. Case law exists to support both views. Blackstone's notion of the prerogative being the powers of an exclusive nature was favoured by Lord Parmoor in the De Keyser's Royal Hotel case of 1920, but some difficulty with it was expressed by Lord Reid in the Burmah Oil case of 1965. A clear distinction has not been necessary in the relevant cases, and the courts may never need to settle the question as few cases deal directly with the prerogative itself.

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