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Plaid Cymru, SNP and Sinn Féin sign new cooperation pact

14 Sep 2026 4 minute read
Left to right: Scottish First Minister and SNP leader John Swinney. photo Jane Barlow/PA Wire. Rhun ap Iorwerth. Photo Jonathan Brady/PA Wire. Northern Ireland First Minister and Sinn Féin vice-president Michelle O’Neill and Sinn Féin president Mary Lou McDonald. Photo Brian Lawless/PA Wire

Nation.Cymru staff/agencies

Plaid Cymru, the SNP and Sinn Féin have signed a new agreement pledging to work together on independence and calling on the UK Government to prepare for constitutional change.

The memorandum of understanding was unveiled as the parties’ leaders met in Cardiff on Monday, with cooperation promised on areas including renewable energy, the economy and relations with Europe.

The agreement says Wales, Scotland and Ireland each have the right to determine their own future through democratic means and argues that the political landscape across the UK and Ireland is changing.

It states: “Momentum is behind our movements; we believe that constitutional change is coming.”

The parties have committed to sharing ideas on building what they describe as stronger and fairer economies, expanding renewable energy and rebuilding relationships with Europe.

They also state that they believe the future of their nations lies in the European Union and insist that Westminster should not be able to block votes on their constitutional futures.

The agreement acknowledges that the three parties have different constitutional positions and that each nation would determine its future “in its own way and in its own time”.

It calls on the UK Government to “prepare for, plan and facilitate constitutional change in each jurisdiction”.

Mr ap Iorwerth was joined in Cardiff by Scottish First Minister and SNP leader John Swinney, Northern Ireland First Minister and Sinn Féin vice-president Michelle O’Neill and Sinn Féin president Mary Lou McDonald.

They were meeting in their capacities as party leaders rather than representatives of their respective governments.

‘Turning point’

Mr ap Iorwerth said May’s Senedd election had been a “turning point for Wales”.

He said: “Across these islands, we are seeing a new political landscape emerge, with a growing recognition that the Westminster model is no longer working.

“Our parties have much to gain from working together, as partners and as equals, where we share common interests and where co-operation can improve the lives of the people we represent.”

Reform UK Wales criticised the meeting, saying: “Plaid Cymru is showing its true colours by meeting with Sinn Féin and the Scottish separatists.”

Welsh Conservative leader Darren Millar also criticised the talks.

He said: “Instead of obsessing about independence, the First Minister should be focused on dealing with the crisis engulfing the Welsh NHS and the declining standards in Welsh schools.

“Grandstanding about referendums will do nothing to improve our emergency departments for vulnerable patients or improve numeracy and literacy for pupils.”

Welsh Liberal Democrat Westminster spokesperson David Chadwick pointed to recent polling showing 68% of people in Wales opposed independence.

He said: “Plaid Cymru should be concentrating on the day job. Wales has some of the worst NHS waiting times in the UK and an economy that has underperformed for far too long. Those are the challenges people expect the Welsh Government to be focused on right now.

“The Liberal Democrats believe in working together, not putting up new borders. It is why we opposed Brexit, and it is why we oppose independence. But that does not mean defending the status quo.

“The United Kingdom clearly needs fundamental reform so that power, wealth and opportunity are shared more fairly across all its nations and regions.”

Mr Chadwick added: “We reject Plaid Cymru’s false choice between independence and carrying on as we are.

“It is perfectly possible to build a stronger, more confident and more powerful Wales within a reformed United Kingdom, and that is the future Welsh Liberal Democrats will continue to fight for.”

The Cardiff talks come amid renewed debate over independence referendums after Prime Minister Andy Burnham suggested another Scottish vote could take place if there was a “clear consensus” for one.

However, a subsequent letter to Mr Swinney said a referendum remained “off limits”.


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13 Comments
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Newest Most Voted
Anianegwr
Anianegwr
11 days ago

I reject Unionism which is Anglo-British Imperialism. I acknowledge Wales’ nationhood and fundemental right to self-governance. I believe Welsh sovereignty belongs to the Welsh people who have a right to democratic representation and the exercising of their sovereignty in their own parliament. The Imperial United Kingdom steals our sovereignty and drowns it in the House of Commons, denying us democratic outcomes in the governance of Wales. It is outrageous. All Unionists should hang their heads in shame at this historic and ongoing injustice and they should abandon their imperialist dogma immediately!

M H
M H
11 days ago
Reply to  Anianegwr

Well said

Mark D
Mark D
11 days ago
Reply to  Anianegwr

Or maybe we live in a democracy and people should have the right to vote for or against independence.

Adam
Adam
11 days ago
Reply to  Mark D

We don’t. One country being controlled by another’s government is not democracy of any kind.

Any vote would be skewed unfairly on independence as many of the incomers despise Cymru and it’s culture and want it gone.
Not very democratic when the voters have been pre programmed.

James Edwards
James Edwards
11 days ago

Cymru will become an independent nation there is no doubt about that.. Just recently an opinion showed that the majority of under 40’s in Wales support independence and that trajectory will only go one way with our young people. It was great to see all the leaders together and nothing desperate ‘traitor’ Dan can do about it because he has zero relevance or power in Cymru

FloatingVoter
FloatingVoter
11 days ago
Reply to  James Edwards

I’m not a Reform voter but it simply isn’t true to say the party has “no relevance” in Wales. 1 in 3 Welsh voters chose Reform in the recent Senedd elections; a third of Welsh people are not irrelevant.

Mark D
Mark D
11 days ago
Reply to  James Edwards

Not true. People’s politics evolve, never more so than when they get older and have greater lived experience.

Hywel Yr Eithaf Dda
Hywel Yr Eithaf Dda
11 days ago
Reply to  Mark D

True, but this works both ways. I was in favour of either a federalist UK, or some sort of autonomous region set up for most of my life, but decades of disappointment and at best indifference from politicians of every shade but green disilusioned me on the union and changed my mind.

David Hughes
David Hughes
11 days ago

Come on Plaid Cymru,we have to succeed in every way for Wales Independece,we have lots and lots of potential,and will succeed.

Adam
Adam
11 days ago

Amazing and momentous times.

Y Cymro
Y Cymro
11 days ago

This is a positive step forward, with Plaid Cymru, the SNP and Sinn Féin having signed a memorandum of understanding today. Unionists must understand that Britain has changed for the better. It is no longer business as usual, with Whitehall demanding “jump” and the devolved nations asking, “How high?” That is the politics of the past; this is the future. Of course, the usual suspects will criticise this pact. But the big difference between this agreement and the pact formed in 2014 between Labour, the Conservatives, the Liberal Democrats and, yes, UKIP is that the 2014 pact was intended to… Read more »

FloatingVoter
FloatingVoter
11 days ago

I actually think that the only way Wales is going to get out of poverty and welfarism is by becoming independent and freeing itself from English subsidy. Only the shock of realising that there is no big brother to pay our bills will jolt us into becoming a harder working, wealth creating economy because we will have no choice. The curious thing to me is that most proponents of Independence seem to think that without England holding us back, we can create a Socialist utopia where everyone lives on generous welfare and wealth is a dirty concept. The reality will… Read more »

Julian Jenkins
Julian Jenkins
11 days ago

When will the people have a voice in the matter?

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