The Irish Question: What Would Brexit Mean?
It is a small place for the big hitters. The Prime Minister, his two immediate predecessors and the Chancellor have all campaigned in Northern Ireland.
The smallest part of the UK is the only part to share a land boundary with another member state of the European Union - the Republic of Ireland.
There has been much debate about whether or not the soft Irish border would have to be hardened but the truth is no one knows.
It would not be a decision for the UK alone but also for Ireland and the rest of the EU for they share the border.
The armoured police checkpoints and customs posts are long gone but Ireland has been exploring the cost of having to re-instate at least some controls.
Until now, the Common Travel Area - an informal agreement - between the two countries has al...