A draft treaty governing Gibraltar’s future relationship with the European Union, published just last week, is facing intense scrutiny and claims from opposition politicians that it risks undermining British sovereignty, with key provisions potentially taking effect in a matter of weeks.
Treaty published amid claims of rushed timeline
The UK government published the draft legal text, which runs to over 1,000 pages with numerous annexes, on February 26, 2026. It aims to establish a “fluid border” with Spain, eliminating routine passport checks for the approximately 15,000 people who cross the frontier daily. However, a review by the pro-Brexit think tank Facts4EU has highlighted an “Explanatory Memorandum” within EU documents stating the agreement is a “matter of special urgency” and should be applied from the date of full deployment of the EU’s Entry/Exit System, “by 10 April 2026.” That date is just five weeks away.
Critics argue this rushed timeline is proceeding with minimal parliamentary oversight. Shadow Foreign Secretary Priti Patel told GB News: “Conservatives will interrogate this 1,000-page treaty… because it places Gibraltar under significant levels of EU law.” Former Conservative MP John Redwood echoed these concerns, stating: “This Treaty is being rushed through with late publication and little publicity. Why?”
Sovereignty at the heart of the debate
The central charge from opponents is that the treaty amounts to a de facto transfer of sovereignty. Facts4EU, in a report previously shared with GB News and compiled with groups including Stand for Our Sovereignty and the Campaign for an Independent Britain, warned that jointly managing Gibraltar’s airport with Spain—with headquarters in an EU country—would constitute a “surrender of sovereignty.”
The think tank’s analysis of the published text asserts that Gibraltar would be required to apply wide swathes of EU customs, goods and regulatory legislation, with future changes automatically taking effect. It also highlights provisions drawing Gibraltar into the EU’s Customs Union framework, applying common external tariffs and procedures. “You are not sovereign if others impose taxes and laws on you,” Mr Redwood said.
However, the UK government and the Government of Gibraltar firmly reject this characterisation. UK Minister for Europe Stephen Doughty stated the treaty “preserves sovereignty” and delivers certainty. Gibraltar’s Chief Minister, Fabian Picardo, described the agreement as “safe and secure,” unequivocally protecting Gibraltar’s sovereignty and economy while preserving the British way of life. The UK government points to a specific sovereignty clause included in the treaty which it says safeguards UK sovereignty over Gibraltar.
Border controls and economic models
The treaty’s practical aim is to remove physical barriers at the land border with Spain, though air and sea arrivals will face dual controls from Gibraltarian and Spanish authorities. Spanish officials will be present to ensure the integrity of the EU’s Schengen Area, though the UK government emphasises Gibraltar is not joining Schengen and that immigration, policing, and justice remain its own authorities’ responsibility. Gibraltar residents will be exempt from the EU’s Entry/Exit System.
Economically, the treaty proposes Gibraltar join a customs union with the EU, allowing for the free circulation of goods without customs checks at the frontier. A new transaction tax will replace the current import duty regime. The Government of Gibraltar estimates the deal could bring economic benefits of around £200 million per year by providing certainty. Critics, however, warn of unknown costs. John Redwood questioned “how much extra tax they will be asked to pay” and the “full costs of all the EU rules,” suggesting the final bill “will come as big shock.”
Legal oversight and historical context
Another point of contention is legal oversight. Facts4EU notes that where EU law is engaged, ultimate interpretation would rest with the European Court of Justice, creating what campaigners see as a line of authority beyond British institutions. Combined with the automatic application of future EU law in certain areas, opponents argue this steadily relocates practical power through binding daily obligations.
The debate unfolds against a long historical backdrop. Gibraltar was ceded to Britain in 1713 under the Treaty of Utrecht. Its population has consistently voted to remain British, including in a 2002 referendum where 99% rejected joint sovereignty with Spain. In the 2016 EU referendum, Gibraltar voted overwhelmingly to remain. The current treaty stems from a political agreement on the core aspects of future relations reached in June 2025, following a framework understanding between the UK and Spain in December 2020.
Political reactions and the path ahead
Reactions in Westminster are sharply divided. Labour leader Sir Keir Starmer has congratulated Chief Minister Picardo on reaching an agreement, stating it will “unlock a secure future” and strengthen UK-Spain relations. In contrast, the Conservative opposition is demanding deeper scrutiny. Priti Patel vowed to “interrogate” the treaty, stating: “Gibraltar is a proud and cherished member of the British family. That is the will of its people. Nothing must put British sovereignty at risk.”
With the treaty expected to be signed in March 2026 and the EU’s Entry/Exit System deadline of April 10 looming, the debate over the balance between practical border fluidity and constitutional sovereignty is intensifying. The UK Parliament is expected to scrutinise the text under the Constitutional Reform and Governance Act 2010, but critics argue the profound implications demand far more detailed examination before any provisions take effect.
