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| Honestly don't get this one. Having an open border for people is not a problem between EU and non-EU states - Sweden and Norway had one for years before both joined Schengen.
What is unavoidable however is a customs border between the North and South. | |
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UK and Ireland are both not in Schengen so today there is no open border for people between these countries and the other EU countries.
Both countries are in the Customs union so there is no Customs border between these countries and the other EU countries today.
In Dover they do control incoming vehicles for illegal imports but oddly there is no red door to drive to if you do have something you want to declare!