N3 v Secretary of State for the Home Department [2025] UKSC 6 (26 February 2025)

The Secretary of State deprived E3 and N3 of British citizenship on national security grounds, claiming they retained Bangladeshi citizenship. After SIAC determined they would be rendered stateless (contrary to section 40(4) of the British Nationality Act 1981), the Supreme Court held that while deprivation orders remained valid for immigration enforcement purposes, appellants retained underlying British citizenship status throughout, making ZA (born during the deprivation period) a British citizen at birth.

Facts

E3 and N3 were dual British-Bangladeshi nationals who were deprived of their British citizenship by the Secretary of State under section 40 of the British Nationality Act 1981 on grounds that their presence was not conducive to the public good due to national security concerns. The Secretary of State was satisfied that the deprivation orders would not render them stateless as she believed they retained Bangladeshi citizenship.

Both E3 and N3 appealed, arguing that under Bangladeshi law they had ceased to be Bangladeshi citizens at age 21, meaning the deprivation orders would render them stateless contrary to section 40(4). Following SIAC’s decision in related cases (C3, C4 and C7), the Secretary of State withdrew the deprivation orders on 20 April 2021 but maintained that E3 and N3 had not been British citizens during the intervening period.

ZA, E3’s daughter, was born on 10 June 2019 during the period when the deprivation order against E3 was in force. The Secretary of State contended ZA was not a British citizen at birth because E3 was not then a British citizen.

Issues

Primary Issue

Whether the absence of statelessness was a precedent fact necessary for the Secretary of State’s power to make a deprivation order, such that if the person would be rendered stateless, the order was automatically void.

Secondary Issue

What is the effect on a deprivation order of a successful appeal to SIAC determining that the order would render the person stateless? Specifically, whether the order should be treated as: (a) a nullity from the outset; (b) only having no effect from the date of the appellate decision; or (c) having some effects only from the date of the appellate decision and some effects from the outset.

Judgment

The Supreme Court allowed ZA’s appeal and allowed N3’s appeal in part.

On the Precedent Fact Argument

The Court rejected the submission that statelessness was a precedent fact. Section 40(4) uses the terminology of the Secretary of State being ‘satisfied’, which confides the issue initially to the Secretary of State’s subjective opinion rather than making it an objective jurisdictional requirement. Parliament could have used different language if it intended statelessness to be a precedent fact but deliberately chose not to.

On the Effect of a Successful Appeal

The Court rejected both extreme positions advanced by the parties. The proper analysis involved a middle position:

The statutory provisions should be given effect to achieve their purpose of providing legal protection for the Secretary of State in relation to immigration enforcement action taken on the basis of a deprivation order. However, once SIAC determines that recognition of the validity of the deprivation order would render the individual stateless and allows the appeal, then for the purpose of determining the individual’s underlying citizenship status (as distinct from the lawfulness of immigration enforcement action), the order is to be treated as having no effect from the outset.

The individual is to be regarded as having been a British citizen throughout. This interpretation reflects the principle of legality protecting fundamental citizenship rights and the presumption that statutes should be interpreted consistently with the UK’s international obligations under the Convention on the Reduction of Statelessness.

Implications

This judgment establishes an important distinction in the effects of a successful appeal against a citizenship deprivation order. While such orders remain valid for the purpose of immigration enforcement actions taken while they were in force (protecting the Secretary of State from claims such as false imprisonment), they have no effect on the underlying citizenship status of the individual once determined to render them stateless.

The decision affirms that British citizenship is a fundamental status protected by the principle of legality, and that statutory provisions affecting citizenship must be interpreted, where possible, consistently with the UK’s international obligations not to render persons stateless. The judgment also clarifies that no further administrative action by the Secretary of State is required to give effect to SIAC’s determination—the Secretary of State is simply bound by it as res judicata.

Verdict: The Supreme Court allowed ZA’s appeal and declared her to be a British citizen. N3’s appeal was allowed in part, subject to the qualifications that the deprivation order remained valid for the purpose of determining the lawfulness of immigration enforcement action taken during the period it was in force.

Source: N3 v Secretary of State for the Home Department [2025] UKSC 6 (26 February 2025)