I was slightly bemused to read in one of my American government essays that one of the distinctions between federal systems and the unitary system used in the United Kingdom is that the U.K. parliament can alter or abolish the Irish legislature at will. (In fairness, I think they tried that, but it never really stuck.)
In the future, I may have to reiterate the Northern part of Northern Ireland when I talk about the concepts of sovereignty and federalism.