Almost every argument about Northern Ireland's future comes back to one idea: consent. Unionists and nationalists both appeal to it. Yet it is often misunderstood. Here is what it means, where it came from, and why it matters.
What the principle of consent means
The principle is simple. Northern Ireland is part of the United Kingdom, and it will stay part of the UK unless a majority of its people vote otherwise in a border poll. If a majority ever did vote for a united Ireland, both governments would be bound to respect that too.
It is written into law in section 1 of the Northern Ireland Act 1998, and into the Belfast Agreement.
Where it came from
Consent did not appear overnight. It was built step by step:
- 1973: the Sunningdale Agreement first recorded both governments' acceptance that Northern Ireland's status could only change with majority consent.
- 1985: the Anglo-Irish Agreement repeated it in an international treaty.
- 1993: the Downing Street Declaration confirmed it again, alongside the right of the people of Ireland, north and south, to decide their own future by agreement.
- 1998: the Belfast Agreement made it the foundation of the peace. It was approved by 71.1% of voters in Northern Ireland and 94.4% in the Republic, in referendums held on the same day.
- 1999: the Republic changed Articles 2 and 3 of its Constitution, replacing its territorial claim with an aspiration to unity achieved only by peaceful means and with the consent of a majority in both jurisdictions.
What it gives unionists
Consent ended any claim that Northern Ireland is "occupied" or illegitimate. The Republic of Ireland, the United Kingdom and the people of both jurisdictions accepted that Northern Ireland is part of the UK for as long as its people want it to be. That is a democratic guarantee no previous generation of unionists had.
What it gives nationalists
Consent also recognises that the desire for a united Ireland is legitimate, and that it can be pursued by peaceful, democratic means. The Agreement also lets everyone here identify as British, Irish or both, and hold either passport or both, whatever happens to Northern Ireland's status.
Common misunderstandings
"Demography means a united Ireland is inevitable." It does not. Religion is not the same as politics. In the 2021 census, slightly more people were from a Catholic background than a Protestant one, but more people described their national identity as "British only" (about 32%) than "Irish only" (about 29%), and about one in five said "Northern Irish only". Many people from every background support the Union, or simply want stability.
"A poll can be called whenever someone demands one." The Secretary of State must call a poll only if it appears likely that a majority would vote to leave the UK. A vote cannot be repeated within seven years.
"Consent only protects unionists." It protects everyone, by making sure Northern Ireland's future is decided by its people at the ballot box, not by violence or pressure.
Why it matters now
Consent asks something of both traditions. Unionists must accept that the nationalist aspiration is legitimate. Nationalists must accept that, as long as most people want it, Northern Ireland's place is in the United Kingdom. The best way to keep that consent is to make Northern Ireland a place where people of every background feel at home within the Union.
