:INFO Three Nationalist Leaders. One Document. The First Time in History. On Monday, September 14, 2026, the first ministers of Scotland, Wales, and Northern Ireland gathered in Cardiff and signed a joint memorandum of understanding. John Swinney (SNP), Rhun ap Iorwerth (Plaid Cymru), and Michelle O'Neill (Sinn Fein), along with Sinn Fein president Mary Lou McDonald, declared that "Westminster's time is coming to an end" and demanded that the British government "prepare for, plan, and facilitate constitutional change" across all three jurisdictions. It has never happened before. Since devolution began in 1999, no moment has arrived when all three non-English regions of the United Kingdom were simultaneously led by parties committed to leaving it. That moment arrived in May 2026, and the Cardiff Pact is its formal expression. :LINK https://www.rte.ie/news/uk/2026/0914/1591410-independence-summit/ RTE News: SF, SNP and Welsh leaders sign deal pushing for independence (primary source, September 14, 2026) :INFO What the May 2026 Elections Changed Scotland has been governed by the SNP since 2007. Northern Ireland has been led by Sinn Fein since 2022, when Michelle O'Neill became the first Irish nationalist First Minister in the history of Stormont. Wales was the missing piece. On May 7, 2026, Plaid Cymru won enough seats in the Senedd to form a government under Rhun ap Iorwerth, ending Labour's decades-long dominance of Welsh politics. With that result, three parties that each want independence from the United Kingdom held executive power outside England simultaneously. The Cardiff summit was convened within weeks. Nicola McEwen of the University of Glasgow described the meeting as holding "symbolic rather than legal significance," but noted the coordinated cooperation "could strengthen the regions' influence over UK policy." :INFO A Memorandum With No Timetable, and a Government That Said No The Cardiff Memorandum carries no date for referendums. Swinney and O'Neill called explicitly for independence votes in their countries. Ap Iorwerth declined to set a timeline for Wales, reflecting Plaid Cymru's more cautious 2026 manifesto position. The three leaders appeared in their capacity as party leaders, not as heads of government, a distinction drawn deliberately because O'Neill governs in a power-sharing executive that includes the Democratic Unionist Party. The trigger for the summit was a stumble by Prime Minister Andy Burnham. He told Parliament he would support a Scottish referendum if there was "clear consensus," then walked it back within days, declaring the matter "off limits." The reversal angered the independence parties and provided the impetus for the Cardiff meeting. Burnham's office responded to the pact with a statement reaffirming his "commitment to the union" and signaling he intends to focus on the cost of living rather than constitutional questions. :QUOTE [quotetype:plain, subtitle:Cardiff Pact joint statement. September 14 2026] For the first time ever, there are first ministers in Scotland, Wales and the North of Ireland who are all committed to independence from the United Kingdom. There could be no clearer sign that Westminster's time is coming to an end. :INFO The DUP, the Unionist Veto, and Why Northern Ireland Is Different DUP Deputy First Minister Emma Little-Pengelly moved immediately to contest the legitimacy of O'Neill's participation. She said O'Neill had "weaponised the role of First Minister" and had "not sought any agreement or permission from me to travel, attend or sign anything as First Minister." The DUP's objection matters procedurally because Northern Ireland's path to a referendum is governed by the 1998 Northern Ireland Act: the British Secretary of State must call a border poll only if it appears likely that a majority would vote for Irish unity. No such determination has been made. :INFO Where the Polls Actually Stand The latest surveys put support for Irish unity at roughly 47 to 50 percent in Northern Ireland, short of the threshold of probability the Secretary of State would need to trigger a vote. Scotland polls consistently show YES at around 56 percent when don't-knows are removed, its highest sustained level since 2014. In Wales, independence support has grown from around 10 percent in 2019 to roughly 35 percent in 2026, still a minority but a tripling in seven years. :LINK https://www.instituteforgovernment.org.uk/our-work/topics/devolution/local-devolved-elections-2026 Institute for Government: Local and devolved elections 2026 (analysis) :INFO Brexit Is the Thread Running Through All Three Arguments The Cardiff Memorandum stated plainly: "Brexit has damaged our economies, and limited opportunities for our people." All three parties are explicitly pro-European. Their joint statement frames future independence not merely as separation from Westminster but as reintegration with the European Union. Scotland has held this position since the 2016 referendum returned a 62 percent Remain vote north of the border. Sinn Fein has long argued that Irish unity would restore EU citizenship to the people of Northern Ireland. Plaid Cymru's shift toward independence accelerated after Wales, which voted 53 percent for Leave in 2016, began to feel the consequences of that vote in agricultural subsidies, export friction, and falling inward investment. No formal timeline for constitutional change exists. What does exist, for the first time, is a written agreement among three governments who each want it, addressed to a prime minister who has said he will not give it to them. :LINK https://abcnews.com/International/wireStory/united-kingdoms-unity-threatened-pact-wales-scotland-northern-136427910 ABC News: United Kingdom's unity threatened by pact between Wales, Scotland and Northern Ireland