Scottish Nationalist Party (SNP) leader John Swinney (behind R) and Rhun ap Iorwerth (2nd L) of Plaid Cymru in Wales arrive to attend a meeting between the leaders of the main Scottish, Northern Irish and Welsh parties in Cardiff, Wales on September 14, 2026, to press for self-determination votes in their territories. The leaders of the main Scottish, Northern Irish and Welsh parties on September 14 declared their right to "self determination" in a joint agreement signed at a rare meeting in the Welsh capital Cardiff. (Photo by Adrian Dennis / AFP via Getty Images)