
It solves lots of the historical problems with the United Kingdom of Great Britain and Northern Ireland, if only by shortening the ridiculously long name for a country - one of the longest on record and more a short essay than the name of a state. It also solves the problem of lots of people not being particular happy with the present arrangement and having various ambitions to belong or not to belong either to England or to the European Union. Some want in; some want out; some want both at the same time it seems, at whatever level you look at it.
The solution is the Union of Scotland and Ireland (both North and South) and the Kingdom of England and Wales.
Northern Ireland, which has always been a problem, both for Ireland and for England gets the best of both worlds. The Protestants, most of whose ancestors came from Scotland not England and so are mostly Presbyterian rather than Anglican only ever really had