[dghf]

This new rule might be problematic for those Northern Irish people who identify solely as Irish (as is their right under the Good Friday Agreement) and who only hold an Irish passport: unless things have changed since the DeSouza case [0], the UK Government and UK law treat everyone born in Northern Ireland (as long as at least one of their parents meets citizenship or residency requirements) as a British citizen, regardless of their opinions on the matter. The UK Government holds that this is compatible with the GFA because you can renounce your British citizenship; but you have to pay hundreds of pounds to do so.

[0] https://en.wikipedia.org/wiki/Emma_DeSouza