UK Court of Appeal hears government's challenge to High Court ruling that the Palestine Action proscription unlawfully breached freedom of expression
The UK Court of Appeal has begun hearing the government's appeal against a High Court ruling that the proscription (formal designation as a terrorist organisation) of Palestine Action was unlawful. The High Court ruled in February 2026 that the ban disproportionately interfered with freedom of expression, a right protected under the Human Rights Act 1998 by reference to Article 10 of the European Convention on Human Rights (ECHR). The proscription remains in force pending the outcome of the appeal. Lawyers for the Home Secretary, Shabana Mahmood, argued before the Court of Appeal that the High Court's finding of a significant impact on freedom of expression was "overstated and wrong" — a direct challenge to the proportionality analysis applied at first instance. The government's core contention is that the proscription of Palestine Action, which carried out direct-action protests targeting defence industry facilities, was a justified and proportionate response to the group's activities. The case has significant practical stakes: more than 2,700 people have been arrested for displaying signs in support of Palestine Action since the proscription took effect. If the Court of Appeal upholds the High Court ruling, those charges could be dropped. The two-day hearing is the latest in a sequence of legal proceedings that have drawn sustained public attention and security provisions around the court.
Why this matters
This appeal raises one of the most consequential questions in current UK public law: the limits of executive power to proscribe protest groups under the Terrorism Act 2000 and the proportionality threshold required to justify restrictions on Article 10 ECHR rights. A Court of Appeal ruling in favour of the government would affirm a broad proscription power; a ruling against would confirm the High Court's proportionality analysis and potentially require the Home Secretary to reconsider the designation. Either outcome will be closely studied by public law and civil liberties practitioners, and will directly affect the criminal exposure of the 2,700-plus individuals arrested. The case also has implications for future proscription decisions, setting the evidential and legal standard the Home Office must meet.
On the Ground
A trainee on the appellant's legal team would assist with the preparation of the skeleton argument for the Court of Appeal hearing — researching the proportionality case law under Article 10 ECHR and organising the chronology of the proscription decision and its consequences. They would also help with court bundle pagination and filing, ensuring all first-instance materials are correctly indexed for the appellate judges.
Interview prep
Soundbite
2,700 arrests hinge on whether the Court of Appeal endorses the High Court's proportionality analysis — the stakes make this a defining public law moment.
Question you might get
“What legal test does a UK court apply when assessing whether a proscription order is a proportionate interference with freedom of expression under the Human Rights Act, and how does it differ from the test applied in a criminal trial of an individual accused of supporting a proscribed organisation?”
Full answer
The UK Court of Appeal is hearing the government's challenge to a High Court ruling that the proscription of Palestine Action as a terrorist organisation unlawfully breached freedom of expression rights under the Human Rights Act. The government argues the High Court overstated the impact on Article 10 ECHR rights; the counter-argument is that a blanket proscription of a protest group is an extraordinary exercise of executive power requiring rigorous proportionality justification. The outcome will determine the criminal exposure of over 2,700 people arrested under the proscription, making this one of the most practically consequential public law cases currently before the courts. For trainees, this illustrates the intersection of public law, human rights, and criminal procedure — areas increasingly relevant to City firms with public law or regulatory advisory capabilities.
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