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Also you don't need a passport to travel from Northern Ireland to the Republic because there literally is no physical border. There are no stops or checkpoints. You can simply drive South until you start seeing road signs in Gaeilge. The concern would be that Brexit would possibly lead to an actual physical border of sorts or disrupt the free movement between both countries.
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My understanding was that neither the United Kingdom or the Republic of Ireland are signatories of the Schengen Agreement and that the Common Travel Area (which was in force long before Schengen) would continue.