Allister warns ECJ ruling could override UK gender law in Northern Ireland

North Antrim MP Jim Allister, speaking in Parliament

A new European court ruling on gender recognition has sparked fresh constitutional concerns in Northern Ireland, with TUV leader Jim Allister warning it could override a landmark UK Supreme Court decision.

The North Antrim MP has raised urgent questions with the UK Government after the European Court of Justice ruled in favour of a transgender woman in the so-called Shipova case—potentially setting up a legal clash with domestic law.

Clash of legal systems

In a statement, Allister said the ruling “sits in sharp contrast” with the UK Supreme Court’s judgment in For Women Scotland v The Scottish Ministers, which determined that biological sex is the defining factor under the Equality Act 2010.

He warned that Northern Ireland’s unique post-Brexit arrangements could mean EU law takes precedence.

“Because the Protocol ties us through Article 2 to EU jurisprudence, we in Northern Ireland could now be faced with the overriding of our own Supreme Court ruling,” he said.

Describing the prospect as “a preposterous position of immense constitutional importance”, Allister added that such an outcome would highlight “the absurd and unacceptable constitutional consequences” of the Windsor Framework.

Urgent question to Westminster

Allister has formally tabled an urgent question to the Secretary of State for Northern Ireland, seeking clarity on how the Shipova ruling will affect gender recognition law in the region.

He asked:

“What assessment has been made of the impact of the Shipova case… on gender recognition in Northern Ireland and on the effect in Northern Ireland of the Supreme Court ruling in For Women Scotland v The Scottish Ministers.”

He also challenged claims that post-Brexit arrangements are limited to trade issues.

“It has been repeatedly claimed that the protocol is all about trade. Here we have another example of how it can potentially divorce Northern Ireland from the rest of the United Kingdom in a plethora of areas.”

What the Shipova ruling means

According to legal analysis published by Scottish Legal News, the ECJ ruling could have significant implications for Northern Ireland.

The court found that EU member states cannot refuse legal gender recognition to transgender citizens who have exercised their right to free movement.

Legal experts say the judgment reinforces long-standing EU principles that transgender individuals should, in most cases, be recognised in their acquired gender under anti-discrimination law.

Professor Colin Murray of Newcastle Law School said the ruling “double underlines” the incompatibility between EU law and the UK Supreme Court’s interpretation.

He noted that:

“To differentiate on the basis of biological sex – as the UKSC did in FWS – is not acceptable under EU law.”

Northern Ireland’s unique position

While the Equality Act 2010 applies in Great Britain, Northern Ireland operates under a different legal framework, with EU equality directives continuing to apply under Article 2 of the Windsor Framework.

This creates the potential for divergence between Northern Ireland and the rest of the UK.

The Equality Commission for Northern Ireland has already asked the High Court in Belfast to clarify how the Supreme Court ruling should be interpreted locally.

Professor Murray explained that, despite Brexit, Northern Ireland courts must still follow EU-derived equality law.

He added that where conflicts arise, courts may be required to follow ECJ case law rather than domestic rulings.

Growing legal and political tension

The debate comes amid wider controversy following the Supreme Court’s 2025 ruling, which led to significant upheaval across Great Britain, including confusion over guidance for businesses and public services.

With Northern Ireland now potentially bound by a different legal interpretation, the issue is likely to intensify both legally and politically in the months ahead.

The UK Government has yet to respond to Allister’s urgent question.

At a glance

• Jim Allister has raised concerns about a new EU gender recognition ruling

• The European Court of Justice ruled in favour of a transgender woman in the Shipova case

• The decision may conflict with the UK Supreme Court ruling in For Women Scotland v The Scottish Ministers

• Northern Ireland could be required to follow EU law under the Windsor Framework

• This raises the possibility of different gender recognition laws between NI and Great Britain

• The Equality Commission has sought legal clarity from the High Court in Belfast

• Legal experts say EU law does not accept distinctions based solely on biological sex

• Allister has asked the UK Government to assess the ruling’s impact

• The issue highlights wider constitutional tensions linked to post-Brexit arrangements