Leaders in Wales, Scotland and Northern Ireland discuss independence and call for constitutional change at summitWestminster’s time is coming to an end, the first ministers of Wales, Scotland and Northern Ireland have said at a landmark summit aimed at putting the UK’s Celtic nations on the path to independence referendums.The Plaid Cymru leader, Rhun ap Iorwerth; the Scottish National party leader, John Swinney; Sinn Féin’s vice-president, Michelle O’Neill, and the president and leader