Full Breakdown
Celtic Nations Leaders Sign Cardiff Memorandum on Self-Determination
By Drooid · · How we work
Core Event: Joint agreement signed in Cardiff
Leaders of the Scottish National Party (SNP), Plaid Cymru and Sinn Féin met in Cardiff and signed a memorandum of understanding that declares “Westminster’s time is coming to an end” and affirms each nation’s right to self-determination. The four signatories—SNP leader John Swinney, Plaid Cymru leader Rhun ap Iorwerth, Sinn Féin vice-president Michelle O’Neill and Sinn Féin president Mary Lou McDonald—participated as party leaders rather than government officials. The document commits the parties to cooperate on economic policy, renewable energy, European relations and constitutional change.
Background & Context
The United Kingdom comprises four constituent countries with distinct legal systems and a devolved arrangement that grants varying powers to Scotland, Wales and Northern Ireland, while defence and foreign affairs remain reserved to Westminster. Scotland held a 2014 independence referendum after Westminster’s approval; 55 % voted to remain. Wales lacks a legal mechanism for an independence referendum, and Northern Ireland’s Good Friday Agreement obliges the British government to call a border poll only if a majority is deemed likely to support a united Ireland. Recent polling shows growing, though uneven, support for constitutional change across the three nations.
Key Figures & Groups
- John Swinney – SNP leader, advocating a second Scottish independence referendum within five years.
- Rhun ap Iorwerth – Plaid Cymru leader, emphasizing policy cooperation while ruling out a Welsh independence referendum in the party’s first term.
- Michelle O’Neill – Sinn Féin vice-president and deputy first minister of Northern Ireland, attending in a party capacity.
- Mary Lou McDonald – Sinn Féin leader, supporting Irish reunification and expecting a border poll by 2030.
- Andy Burnham – Prime minister of the United Kingdom, stating further referendums on Scottish independence are “off limits.”
- Emma Little-Pengelly – DUP MLA, criticizing O’Neill’s representation of the Northern Ireland executive.
- Gavin Robinson – DUP leader, echoing unionist objections.
Data & Statistics
- A Survation poll finds 47 % of Scottish voters would back independence in a hypothetical referendum.
- A University of Liverpool survey reports 36 % of respondents in Northern Ireland would support a united Ireland.
- A Survation poll for Wales shows 32 % backing independence.
Official Statements & Responses
- Prime minister Andy Burnham reiterated on August 27 that a referendum on Northern Ireland leaving the UK is “off the table” and that another Scottish independence referendum is also “off limits.”
Criticism & Opposition
Unionist politicians argued that O’Neill’s presence misrepresented the authority of the Northern Ireland executive. The DUP’s Gavin Robinson described the event as “stunt politics,” suggesting the parties’ pledge “counts for nothing.”
Verbatim Quotes
- “Westminster's time is coming to an end” — Ahead
- “I looked very carefully at what was briefed out, what was reported, it was being reported as if this was a summit of first ministers,” — Emma Little-Pengelly
- “When it comes to important government discussions and engagement across this United Kingdom, Michelle O'Neill will not be a part of those discussions today, and it's Plaid Cymru and the SNP alone,” — Gavin Robinson
What’s Next
- The UK prime minister is expected to meet the three nationalist leaders next month to discuss devolution arrangements.
- Sinn Féin anticipates a border poll on Irish reunification by 2030, while the SNP continues to press for a second Scottish independence referendum within the next five years.