Factual and Procedural Background
“Agency” is a branch of the public service charged with signals intelligence and communications security. From 1947 onward, its employees were encouraged to join national trade unions, and a well-established practice of consultation existed between management and unions regarding employment conditions. Between 1979-1981, employees at the Agency engaged in seven instances of industrial action (one-day strikes, work-to-rule, overtime bans) in support of wider civil-service disputes. Government officials believed that these actions jeopardised national security.
On 22 December 1983 the Respondent (also the Prime Minister), acting under article 4 of the Civil Service Order in Council 1982, orally instructed that Agency staff could no longer belong to national trade unions; membership was restricted to an internal staff association approved by the Agency’s director. The announcement, made public on 25 January 1984, came without prior consultation and prompted strong objection from the unions and employees.
The first two Appellants (a federation of civil-service unions and its secretary) and individual employees sought judicial review. Judge Glidewell granted a declaration that the instruction was invalid for procedural unfairness. The Court of Appeal reversed that decision. The present judgment concerns the Appellants’ further appeal to the supreme appellate court.
Legal Issues Presented
- Whether courts may review the exercise of a royal prerogative power delegated under an Order in Council.
- Whether Agency employees had a legitimate expectation of prior consultation before changes to their trade-union membership rights.
- Whether considerations of national security can lawfully override any duty to consult and, if so, whether the evidence showed that national security justified the Respondent’s action.
Arguments of the Parties
Appellants’ Arguments
- The instruction was procedurally invalid because the Respondent owed a duty of fairness to consult the unions, arising from a long-standing practice of consultation.
- The royal prerogative does not place executive decisions beyond judicial scrutiny, especially where individual rights or legitimate expectations are affected.
- No adequate evidence showed that consultation would endanger national security, rendering the failure to consult unjustified.
Respondent’s Arguments
- Decisions taken under the royal prerogative, or pursuant to powers delegated from it, are generally immune from judicial review, particularly where national security is involved.
- Even if reviewable, any duty to consult was displaced because consultation carried a “real risk” of renewed industrial disruption threatening national security.
- Evidence of past disruption and union statements demonstrated that prior consultation would have compromised the Agency’s operations; therefore, the instruction was lawful and proportionate.
Table of Precedents Cited
| Precedent |
Rule or Principle Cited For |
Application by the Court |
| Attorney-General v. De Keyser’s Royal Hotel Ltd. (1920) |
Courts may examine the existence and extent of prerogative powers. |
Confirmed that prerogative powers can be scrutinised; focus then shifted to scope and reviewability. |
| Burmah Oil Co. Ltd. v. Lord Advocate (1964) |
Judicial willingness to analyse prerogative action affecting private rights. |
Displayed courts’ capacity to review prerogative acts, supporting reviewability here. |
| Reg. v. Criminal Injuries Compensation Board, Ex parte Lain (1967) |
Bodies created under the prerogative are amenable to certiorari. |
Used to justify treating article 4 powers like statutory powers for review purposes. |
| Associated Provincial Picture Houses Ltd. v. Wednesbury Corporation (1948) |
Standard of “irrationality” for administrative review. |
Court accepted that prerogative decisions could, in theory, be quashed if Wednesbury-unreasonable. |
| O’Reilly v. Mackman (1983) |
Concept of “legitimate expectation” as a public-law interest. |
Applied to recognise employees’ prima facie expectation of consultation. |
| Attorney-General of Hong Kong v. Ng Yuen Shiu (1983) |
Failure to honour a representation may breach fairness. |
Analogous support for the employees’ claimed expectation. |
| The Zamora (1916) |
Proof, not assertion, required when Crown relies on national security. |
Guided court to examine whether security reasons were evidenced. |
| Chandler v. Director of Public Prosecutions (1964) |
Courts defer to executive on security facts once sufficient evidence exists. |
Relied on to uphold ministerial assessment of security risk. |
| Chief Constable of North Wales Police v. Evans (1982) |
Judicial review concerns the decision-making process, not merits. |
Framed inquiry into whether process, not outcome, was unfair. |
| Reg. v. Secretary of State for Home Affairs, Ex parte Hosenball (1977) |
Natural-justice requirements may yield to national security. |
Supported conclusion that consultation duty was displaced. |
Court’s Reasoning and Analysis
1. Reviewability of prerogative powers. All judges agreed that the mere fact a power derives from the royal prerogative does not automatically insulate it from review. The key determinant is the subject-matter. Because altering civil-service terms and conditions is in principle justiciable, the instruction could be reviewed.
2. Existence of a legitimate expectation. Decades of consistent consultation between management and unions generated a legitimate expectation that staff would be consulted before material changes to employment conditions. In ordinary circumstances, failure to consult would breach procedural fairness.
3. National security as an overriding factor. The Respondent produced affidavit evidence from senior officials describing prior disruption and union documentation encouraging selective strikes at sensitive installations. The majority accepted that consultation risked precipitating fresh disruption that could impair intelligence operations critical to national security.
4. Balancing fairness against security. Where consultation would itself endanger national security, the duty to consult is displaced. Drawing upon The Zamora and Chandler, the court concluded that ministers are the “sole judges” of national-security requirements once adequate evidence is provided. The evidence satisfied that threshold.
5. Other grounds. Challenges alleging lack of a valid “instruction” or insufficient specificity were rejected; the oral direction, later confirmed in writing, fell within article 4. The court also declined to rely on international labour conventions, as they were not incorporated into domestic law.
Holding and Implications
APPEAL DISMISSED. The instruction barring national union membership at the Agency was held valid and effective.
Implications: The judgment affirms that prerogative powers are generally reviewable on the established public-law grounds but recognises a strong, sometimes decisive, deference to executive assessments of national security. It clarifies the doctrine of legitimate expectation, confirming that it can be overridden where credible evidence shows that procedural fairness would compromise national safety. No new legal remedy was created, but the decision delineates the boundary between judicial oversight and executive discretion in security-sensitive contexts.