Pro-independence leaders of Scotland, Wales and Northern Ireland set to sign breakup pact in Cardiff

On Monday the heads of the Scottish National Party, Plaid Cymru and Sinn Féin will gather in Cardiff to sign a joint declaration calling for the right to hold independence references and ultimately break up the United Kingdom. John Swinney, Rhun ap Iorwerth and Michelle O’Neill will describe the gathering as a party‑leader discussion rather than an official government summit, a framing intended to ease concerns in London.

The meeting follows the May elections, which gave pro‑independence parties majorities in Scotland, Wales and Northern Ireland for the first time. Swinney said one outlet constitutional momentum is unprecedented, and Prime Minister Andy Burnham hinted that a future Scottish independence vote could be considered.