Lumba (WL) v Secretary of State for the Home Department

Factual and Procedural Background

The opinion concerns two foreign-national prisoners (“FNPs”), Appellant 1 (a citizen of “The DRC”) and Appellant 2 (a citizen of “Country B”). Each completed custodial sentences in The United Kingdom and, shortly before their release dates in 2006, were:

• served with notices of the Secretary of State’s intention to deport them under s 3(5)(a) Immigration Act 1971;
• detained under paragraph 2 of Schedule 3 to that Act “pending deportation”.

Between 2006 and 2008 the Secretary of State’s published detention policy stated a presumption in favour of temporary release, whereas an unpublished policy operated in practice and imposed what senior officials later described as a “near blanket ban” on releasing FNPs.

Both appellants issued judicial-review claims challenging the legality of their detention. In 2008 the High Court (Judge A) found parts of the detention policy unlawful but rejected the false-imprisonment claims. In 2010 the Court of Appeal (Court comprising Judge B, Judge C and Judge D) upheld most of that decision. The present judgment is that of the Supreme Court on further appeal.

Legal Issues Presented

1. Whether the unpublished “blanket” policy was unlawful because it fettered discretion, conflicted with published guidance, lacked publication, and/or contained a presumption of detention.
2. If the policies were unlawful, whether the appellants’ detention was thereby unlawful and constituted the tort of false imprisonment.
3. Whether, if unlawful, the appellants were entitled to more than nominal compensatory damages.
4. For Appellant 1 only: whether the length of his detention breached the Hardial Singh principles (reasonableness and purpose of detention).
5. Whether exemplary (punitive) or “vindicatory” damages should be awarded.

Arguments of the Parties

Appellants’ Arguments

• Detention after completion of sentences was based on an unpublished, blanket policy inconsistent with published guidance—making it unlawful.
• The policy prevented individualised assessment and ignored the Hardial Singh principles, so each detention was ultra vires and a false imprisonment.
• They were entitled to substantial or, alternatively, vindicatory and exemplary damages rather than merely nominal sums.

Secretary of State’s Arguments

• Schedule 3 gives a broad statutory power; even if the wrong policy wording was used, each appellant would inevitably and lawfully have been detained under the published policy.
• Any public-law error in policy application did not invalidate detention where power existed and would have been exercised identically (“causation” defence).
• If a public-law error existed, only nominal damages were recoverable; exemplary or vindicatory awards were inappropriate.

Table of Precedents Cited

Precedent	Rule or Principle Cited For	Application by the Court
R v Governor of Durham Prison, Ex p Hardial Singh [1984] 1 WLR 704	Detention pending deportation must be for reasonable period and purpose	Formed core test for lawfulness of detention and length thereof
Chahal v UK (1996) 23 EHRR 413	Article 5(1)(f) requirements; detention must not be arbitrary	Compared domestic principles with ECHR standards
Saadi v UK (2008) 47 EHRR 17	Interpretation of Art 5(1)(f); proportionality applies only to length	Supported majority’s view on limited proportionality test
Christie v Leachinsky [1947] AC 573	False imprisonment where arrest not justified on stated grounds	Discussed distinction between lawful power and unlawful exercise
Roberts v Chief Constable of Cheshire [1999] 1 WLR 662	Failure to comply with statutory review renders detention unlawful	Cited in debate on causation and nominal damages
Tan Te Lam v Superintendent Tai A Chau [1997] AC 97	Applied Hardial Singh to Hong Kong detention	Used as analogous authority
R (I) v SSHD [2003] INLR 196	Four-point summary of Hardial Singh principles	Endorsed yet critiqued within majority/minority reasoning
SK (Zimbabwe) v SSHD [2009] 1 WLR 1527	Effect of procedural failures on detention legality	Contrasted with current findings on policy illegality
Holgate-Mohammed v Duke [1984] AC 437	Wednesbury review and false imprisonment	Minority relied on; majority distinguished
Attorney General of Trinidad & Tobago v Ramanoop [2006] 1 AC 328	Concept of vindicatory damages	Used to reject/limit such awards in UK tort claims

Court’s Reasoning and Analysis

Majority (Judges X, Y, Z, etc.)

• The unpublished policy was unlawful: (a) it imposed an inflexible “blanket” approach; (b) it conflicted with published guidance; (c) it was secret, denying transparency required by rule of law.
• Because that unlawful policy was applied to the appellants, each decision to detain was itself unlawful, rendering the detention a false imprisonment. The fact that they would also have been detained under the published policy did not cure illegality.
• Nevertheless, had the lawful policy been applied the outcome would certainly have been the same. The appellants therefore suffered no compensable loss; only nominal damages (£1 accepted figure) are appropriate.
• The period of Appellant 1’s detention requires reconsideration against the Hardial Singh criteria in light of updated psychiatric evidence; that question is remitted to the High Court.
• Exemplary damages are reserved for oppressive, arbitrary or unconstitutional executive conduct. Although the Home Office’s behaviour was “deplorable”, it did not reach that threshold; vindicatory damages are not recognised as a separate tort remedy in English law.

Minority (Judges A & B)

• Public-law errors in applying policy do not automatically vitiate detention where statutory power existed and would have been inevitably exercised.
• The appellants’ detention was therefore lawful; no liability for false imprisonment arises and damages should be refused.

Holding and Implications

Holding: The appeals are ALLOWED. The Secretary of State is liable for false imprisonment, but only nominal damages are awarded. The legality of the length of Appellant 1’s detention is remitted for fresh determination. Exemplary and vindicatory damages are refused.

Implications:

• Executive detention decisions must comply with published policies; secret or inconsistent practices expose the Crown to liability—even if outcomes would be unchanged.
• However, where lawful detention was inevitable, compensation will be restricted to nominal sums, limiting fiscal exposure for purely procedural breaches.
• The judgment clarifies (and divides) Supreme Court thinking on the interaction between public-law error and private-law torts, influencing future challenges to immigration detention.
• Guidance is given on the non-availability in English common law of “vindicatory” damages distinct from compensatory or exemplary awards.