A United Front Against the Union: Celtic Leaders Prepare Landmark Cardiff Declaration
Scotland, Wales and Northern Ireland’s nationalist leaders will demand democratic routes to self-determination—but the three nations face very different constitutional paths
13 September 2026. The leaders of the governing nationalist parties in Scotland, Wales and Northern Ireland are preparing to meet in Cardiff on Monday, 14 September, for an unprecedented summit that could mark a significant new stage in the debate over the future of the United Kingdom.
Scottish National Party leader John Swinney, Plaid Cymru leader Rhun ap Iorwerth and Sinn Féin vice-president Michelle O’Neill are expected to sign a memorandum of understanding asserting that their nations should have the right to determine their constitutional futures through democratic referendums.
Although all three are First Ministers, reports indicate that they will sign the declaration in their capacities as party leaders rather than as heads of their respective devolved governments. This is an important distinction: the memorandum will represent a coordinated political position, not a legally binding act capable of authorising referendums or dissolving the United Kingdom. Nation.Cymru


%20(2).jpg)
