PoliticsDraft
Celtic party leaders call on Westminster to prepare for constitutional change
Plaid Cymru, SNP and Sinn Féin leaders have signed a Cardiff memorandum calling for processes that could enable independence or Irish reunification.
Event
Celtic party leaders to affirm right of Wales, Scotland and Northern Ireland to seek independence
Political leaders from Wales, Scotland and Northern Ireland met in Cardiff and signed a memorandum recognising growing support for constitutional change and calling on the British government to facilitate independence or reunification processes.
2 published stories · security · source reliability 33%
Background
Why this event matters
Leaders from Plaid Cymru, the SNP and Sinn Féin met in Cardiff and signed a memorandum calling on the UK government to facilitate possible independence or Irish reunification processes. They said each jurisdiction’s people should decide their constitutional future. The memorandum also covered cooperation on the economy, energy and international affairs. The gathering involved party leaders, not governments acting formally.
event-brief
Celtic party leaders to affirm right of Wales, Scotland and Northern Ireland to seek independence
Leaders from Plaid Cymru, the SNP and Sinn Féin met in Cardiff and signed a memorandum calling on the UK government to facilitate possible independence or Irish reunification processes. They said each jurisdiction’s people should decide their constitutional future. The memorandum
Reporting trail
The Guardian Politics | https://www.theguardian.com/politics/2026/sep/14/westminster-first-ministers-uk-celtic-nations-wales-northern-ireland-scotland | published 2026-09-14T13:21:16.000Z | primary sourceThe Guardian Politics | Primary report of the Cardiff summit, memorandum, political positions and UK government responseEvent digest | Concise summary of the reported constitutional-change callRetrieved context: SAME_EVENT | Corroborates the summit and memorandum as the same eventThe Guardian Politics | https://www.theguardian.com/politics/2026/sep/13/first-ministers-to-affirm-right-to-seek-independence-from-the-uk | published 2026-09-13T16:16:21.000Z | primary sourceThe Guardian Politics | Primary report on the summit, proposed memorandum, political context and polling claims.Event digest | Concise confirmation of the expected memorandum and summit agenda.Retrieved context: cluster summary | Matches the event digest; confidence stated as 0.98.Retrieved context: historical context and background cards | Unrelated material; does not inform this event.
Fact cards
entity brief
Celtic party leaders to affirm right of Wales, Scotland and Northern Ireland to seek independence: key people and institutions
Key entities: Rhun ap Iorwerth, John Swinney, Michelle O’Neill, Mary Lou McDonald, Cardiff.
faq brief
Celtic party leaders to affirm right of Wales, Scotland and Northern Ireland to seek independence: key questions
What did the leaders sign? A memorandum calling for the UK government to prepare for and facilitate independence or Irish reunification processes. Who took part? Rhun ap Iorwerth, John Swinney, Michelle O’Neill and Mary Lou McDonald, representing Plaid Cymru, the SNP and Sinn Féi
source brief
Celtic party leaders to affirm right of Wales, Scotland and Northern Ireland to seek independence: reporting sources
The Guardian Politics | https://www.theguardian.com/politics/2026/sep/14/westminster-first-ministers-uk-celtic-nations-wales-northern-ireland-scotland | published 2026-09-14T13:21:16.000Z | primary source | The Guardian Politics | Primary report of the Cardiff summit, memorandum,
timeline brief
Celtic party leaders to affirm right of Wales, Scotland and Northern Ireland to seek independence: timeline
May 2026: Plaid Cymru won the Senedd elections, according to the report, placing separatist parties in government in Wales, Scotland and Northern Ireland. 2026-09-14: Rhun ap Iorwerth, John Swinney, Michelle O’Neill and Mary Lou McDonald met in Cardiff and signed a memorandum on
Timeline
May 2026
Plaid Cymru won the Senedd elections, according to the report, placing separatist parties in government in Wales, Scotland and Northern Ireland.
2026-09-14
Rhun ap Iorwerth, John Swinney, Michelle O’Neill and Mary Lou McDonald met in Cardiff and signed a memorandum on self-determination and constitutional change.
By 2030
McDonald said she expected an Irish reunification poll.
Within five years
The SNP wants a second Scottish independence referendum.
FAQ
What did the leaders sign?
A memorandum calling for the UK government to prepare for and facilitate independence or Irish reunification processes.
Who took part?
Rhun ap Iorwerth, John Swinney, Michelle O’Neill and Mary Lou McDonald, representing Plaid Cymru, the SNP and Sinn Féin.
Did the memorandum set a referendum timetable?
No. It expresses political intent but does not establish a legal process or timetable.
What is the UK government’s position?
It said economic security was a priority over constitutional debates or further referendums.
What are the reported support figures?
The report cited 47% in Scotland, 36% in Northern Ireland and 32% in Wales, without identifying polling methods.
What are the leaders expected to sign?
A memorandum calling on Westminster to prepare for constitutional change in Wales, Scotland and Northern Ireland.
Who is expected to sign it?
Plaid Cymru leader Rhun ap Iorwerth, SNP leader John Swinney and Sinn Féin leader Michelle O’Neill.
Does the memorandum authorise independence referendums?
No. Its exact wording and practical consequences have not been provided.
What else will the summit discuss?
Europe, international cooperation, the economy and energy.
What does the supplied polling indicate?
Reported support for independence was 47% in Scotland, 36% in Northern Ireland and 32% in Wales, if referendums were held immediately.