R (Begum) v Special Immigration Appeals Commission [2021] UKSC 7

Shamima Begum left the United Kingdom aged 15 and travelled to Syria, where she aligned herself with Islamic State. In 2019 the Home Secretary deprived her of British citizenship on national-security grounds. She was then living in a camp in northern Syria and could not participate effectively in her appeal to the Special Immigration Appeals Commission from there. The Court of Appeal held that fairness required her to be allowed to enter the United Kingdom to conduct the appeal. The Home Secretary appealed, arguing that the assessment of security risks belonged to the executive and that entry should not be ordered merely because the overseas proceedings could not presently be fair.

Could Begum be granted leave to enter the United Kingdom so that her citizenship appeal could be fairly pursued, and how should courts review the Home Secretary's national-security assessment?

The Supreme Court unanimously allowed the Home Secretary's appeal. The Court of Appeal had not applied ordinary judicial-review principles and had substituted its own assessment of national-security risk. Unless the executive assessment was legally defective, the court had to respect the institutional competence and responsibility of the Home Secretary. A fair and effective appeal was not then possible from the camp, but that did not require admission to the United Kingdom. Where no fair hearing can presently occur without creating risks the executive lawfully judges unacceptable, the appeal should ordinarily be stayed until circumstances change. The judgment did not decide the ultimate merits of the citizenship deprivation or declare that national security automatically defeats fairness.

Courts reviewing an executive national-security assessment apply ordinary public-law principles and must not substitute their own view merely because they would balance the risks differently. If a fair appeal cannot presently proceed and lawful security concerns preclude the claimant's return, a stay may be the appropriate response.

Begum is important for the boundary between judicial responsibility for legality and executive responsibility for national security. It rejects a free-standing judicial balancing exercise that disregards the standard of review applicable to the decision-maker. The case also shows that procedural unfairness does not invariably determine the substantive outcome sought by a claimant. Its reasoning must be kept within context: courts retain responsibility for legal limits, evidence, rationality and fair procedures, while the appeal's merits were for SIAC. Later proceedings considered the deprivation decision on that basis.