Scottish, Welsh, and Northern Irish leaders to demand independence referendums at Cardiff summit

Joint summit in Cardiff

The first ministers of Scotland, Wales, and Northern Ireland will gather in Cardiff on 14 September 2026 to sign a joint declaration demanding the right to self-determination. Scottish First Minister John Swinney of the Scottish National Party, Welsh First Minister Rhun ap Iorwerth of Plaid Cymru, and Northern Ireland First Minister Michelle O'Neill of Sinn Féin will convene at a luxury hotel in the Welsh capital. Sinn Féin President and Irish opposition leader Mary Lou McDonald will also participate in the discussions. The politicians are attending the summit in their roles as leaders of pro-independence political parties rather than as formal representatives of their regional executives. Together, they plan to sign a joint memorandum of understanding calling on the central government in London to permit independence referendums across the devolved nations.

Push for self-determination

The summit agenda will cover the constitutional paths of the three nations alongside cross-border cooperation on economic policy, energy grids, and relations with the European Union. Swinney noted ahead of the Cardiff talks that the current political landscape across the British Isles is without precedent, as pro-independence parties now govern all three devolved territories simultaneously.

For the first time in history, Scotland, Wales and Northern Ireland are led by prime ministers who favour independence. There could not be a clearer sign that the status quo is not sustainable and that Westminster must prepare for a post-United Kingdom future.

Swinney also asserted that British Prime Minister Andy Burnham will have to accept constitutional transformation and risks becoming the final prime minister of the United Kingdom. Ap Iorwerth stated that the summit does not seek direct unilateral dissolution of the state, maintaining that the primary goal is empowering Wales and ensuring that any constitutional decision reflects the express democratic will of the Welsh people.

Downing Street resistance and diplomatic reactions

The joint initiative follows political friction between devolved leaders and the central government in London over constitutional powers. Prime Minister Andy Burnham previously told lawmakers in the House of Commons that he might consider authorizing a Scottish independence referendum if a clear consensus emerged. However, Downing Street rapidly moved to dismiss that interpretation, sending a formal letter to Swinney confirming that another independence vote remains strictly ruled out. British central governments have maintained a policy against further secession ballots since the Scottish independence referendum in 2014. The political context widened on 12 September 2026, when United States President Donald Trump visited Dublin and told reporters that he would like to see a united Ireland, describing such an outcome as a positive development.

Shifting parliamentary balances

The collective push is underpinned by the results of regional elections held in May 2026, which altered the balance of power across the devolved parliaments. In Wales, heavy electoral losses for the Labour Party allowed Plaid Cymru to emerge as the largest legislative party, propelling ap Iorwerth to the office of first minister. In Scotland, the SNP preserved its dominant status in parliament despite losing six seats in the previous vote, while Sinn Féin maintains its hold on the executive in Belfast. Sinn Féin party representatives stated through the Press Association that the Good Friday Agreement provides the democratic pathway to determine Ireland's constitutional future. The party reiterated that preparations for a border poll and Irish unity should commence without delay.