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Scotland, Wales and Northern Ireland’s leaders are set to meet in Cardiff to discuss greater self-determination and constitutional reform.
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The summit brings together pro-independence governments seeking closer cooperation on the economy, energy, Europe and constitutional powers.
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Westminster maintains there is currently no clear consensus for another Scottish independence referendum or Northern Ireland leaving the UK.
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The meeting could deepen debate over the future of the Union as nationalist parties coordinate pressure for greater autonomy and potential independence.
September 14, (THEWILL) – Leaders of Scotland, Wales and Northern Ireland are due to meet in Cardiff on Monday, September 14, 2026, as pro-independence parties step up pressure for greater constitutional powers and the right to determine the future of their nations within the United Kingdom.
Scottish First Minister John Swinney, Welsh First Minister Rhun ap Iowerth and Northern Ireland First Minister Michelle O’Neill are expected to sign a joint declaration supporting greater self-determination, including the possibility of future independence or reunification votes.
Mary Lou McDonald, Sinn Féin president and opposition leader in the Republic of Ireland, is also expected to attend the meeting at St David’s Hotel in Cardiff Bay.
The summit will focus on cooperation across the economy, energy, relations with Europe and constitutional reform, amid renewed debate over the long-term structure of the UK.
The meeting is particularly significant because governments in Scotland, Wales and Northern Ireland are now led by parties advocating substantial constitutional change.
Pro-independence parties tighten their grip across three UK nations
The Scottish National Party remains in power in Scotland, while Plaid Cymru emerged as the largest party in the Welsh Senedd following elections in May. Sinn Féin became the largest party in Northern Ireland’s 2022 Assembly election, with O’Neill taking office as First Minister in 2024 following the restoration of devolved government.
Swinney said the political developments showed growing dissatisfaction with the existing constitutional settlement.
“For the first time ever, Scotland, Wales and Northern Ireland are led by pro-independence first ministers,” he said. “There could be no clearer sign that the status quo is not sustainable.”
The three parties are expected to seek closer cooperation on economic policy and renewable energy, while advocating stronger relations with the European Union. The SNP and Plaid Cymru support eventual EU membership for independent Scotland and Wales, while Sinn Féin argues that Northern Ireland could return to the bloc through Irish reunification.
The meeting comes amid renewed discussion about the conditions under which another Scottish independence referendum could take place.
Prime Minister Andy Burnham has indicated that a referendum could be considered if a “clear consensus” emerged, but has ruled out another vote before the next UK general election.
Westminster pushes back against fresh independence referendums
In a letter to Swinney, Burnham said the Labour manifesto underpinning the government’s parliamentary majority explicitly opposed both Scottish independence and another referendum.
He also argued that there was currently no clear evidence of majority support in Northern Ireland for leaving the UK, saying constitutional referendums would distract the government from economic growth and tackling the cost of living.
In Wales, Plaid Cymru is expected to press for greater fiscal and administrative powers, including increased control over taxation, public spending, policing and rail funding.
The party is also seeking the devolution of Crown Estate revenues generated in Wales, including income linked to offshore wind developments, which currently flows to the UK Treasury.
A Plaid Cymru source said cooperation among the nationalist parties could allow them to pursue shared interests while retaining their separate constitutional objectives.
Sinn Féin, meanwhile, is expected to use the meeting to reinforce calls for preparations for a referendum on Irish reunification under the provisions of the Good Friday Agreement.
“The Good Friday Agreement gives us the democratic means to decide it, and now is the time to prepare seriously for that choice,” a Sinn Féin source said.
Three nations, three different routes to constitutional change
The debate has also gained international attention after US President Donald Trump reportedly said during a visit to Dublin that he would “love” to see a united Ireland, describing the prospect as potentially “a great thing”.
Despite the increasingly coordinated approach of nationalist parties, the constitutional routes facing the three nations differ considerably.
Scotland’s independence debate centres on whether Westminster would authorise another referendum following the 2014 vote, while Welsh nationalism has traditionally attracted less support for outright independence. Northern Ireland’s position is governed by the Good Friday Agreement, which provides a mechanism for a border poll if the conditions for one are judged to have been met.
Monday’s summit nevertheless represents an attempt by the three administrations to coordinate pressure on Westminster while presenting constitutional change as part of a broader agenda covering economic powers, energy and relations with Europe.
The leaders are expected to hold a joint press conference following the meeting.
Segun Adeyemi serves as the Associate Editor of THEWILL Newspaper, leveraging more than ten years of editorial expertise and a proven track record in mainstream journalism.
