14 September 2026
The leaders of Plaid Cymru, the SNP and Sinn Féin meet in Cardiff today to strengthen the co-operation of Wales, Scotland and Ireland and build towards constitutional change.
Ahead of today’s meeting, the Leader of Plaid Cymru Rhun ap Iorwerth, Leader of the Scottish National Party John Swinney, Sinn Féin President Mary Lou McDonald and Sinn Féin Vice-President Michelle O’Neill have agreed a Memorandum of Understanding as to how the parties can work constructively with one another in the shared interests of the people they represent.
Memorandum of Understanding
Scotland, Wales and Ireland have distinct histories, identities and political traditions.
Each of our nations has the right to determine its own future, through democratic means and in accordance with the wishes of its people.
Today, Plaid Cymru, the Scottish National Party and Sinn Féin are coming together to reaffirm our commitment to working constructively with one another in the shared interests of our people.
We share a belief that the nations and communities we represent deserve greater ambition, greater economic opportunity and a stronger voice in determining their own futures.
The political landscape across these islands is changing.
For the first time ever, people across these islands have First Ministers in Scotland, in Wales and in the North of Ireland who are all committed to independence from the United Kingdom. For people watching across these islands – for people watching around the world – there could be no clearer sign that Westminster’s time is coming to an end.
We believe there is a better way: nations working together as equals, sharing ideas and expertise, and building relationships based on mutual respect and common interests.
Momentum is behind our movements; we believe that constitutional change is coming.
We therefore commit to strengthening cooperation between our parties and identifying practical areas where working together can make a real difference.
These include:
We recognise that our parties have different constitutional positions and that each nation will determine its own future in its own way and in its own time.
What unites us is a determination to ensure that the voices of our nations are heard, that our people have the opportunity to thrive and that cooperation between Scotland, Wales and Ireland can be strengthened.
We call for the British Government to prepare for, plan and facilitate constitutional change in each jurisdiction.
The future should be one in which our nations can cooperate confidently, speak for themselves and build relationships with one another and with the wider world based on equality, respect and mutual benefit.
Today marks a further step in building that cooperation.