The scenario is different compared to Catalonia, the Catalonia scenario is more like the Scottish independence referendum, a new country would be created in that scenario.

The Good Friday agreement permits Northern Ireland to leave the UK and to join the ROI, there is no path to independence here.

Reunion can only happen by mutual consent of all people in Ireland, and the document demands two simultaneous referenda to occur to fulfil this, one in NI, the other in ROI.

The referendum in NI, can be called at any time the UK’s Secretary of State for NI, deems that it would be likely that it would prove to be successful. This stance is shared by the Tories and Labour in Westminster.

Unlike Catalonia, there is also likely to be wider support for reunion from other important third parties - namely the US and EU - The United States, both from her people and government, proving to be key mediators in the Good Friday negotiations, and subsequent important negotiations like the Richard Haass talks.

The EU, prior to the UK’s withdrawal from it, funded large regeneration and reconciliation projects within NI. I believe this would continue forward post reunification.