Inside Europe: Could Brexit turn the clock back in Ireland?

Northern Ireland is part of the UK and will be voting in the Brexit referendum on June 23. After the divisive years of the Troubles, people in the north and south of Ireland can now effortlessly cross a non-existent physical border. But what if the UK votes to leave Europe? Emma Wallis talks to veteran journalist David McKitrrick in Belfast about what the referendum means for this island.