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When peace came to Northern Ireland, British military installations were gradually dismantled along it’s border with the Republic of Ireland in the south. Now it is almost invisible and the free flow of goods and people across it was made easy by the two countries’ membership of the European Union’s single market and customs union.
But in March 2019, Britain will stop being an EU country and one of the biggest puzzles of Brexit is how to keep the Irish border open without introducing checks on goods and people.
In the first of a 5-part series on the possible consequences of Brexit, Andrew Connelly hears how businesses along that border are worried that controls will hit their economies.