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It's the biggest sticking point in negotiations for the UK to leave the European Union. We examine the complex history, hear from workers and businesses on either side of the Irish border and try to unravel the complex web of politics.

Justin Rowlatt meets lorry drivers who work across the island of Ireland, frontier workers who live in Northern Ireland and work in the Republic, and a farmer whose land straddles the divide.

Belfast-based journalist Amanda Ferguson explains why the island of Ireland is divided and why that's still a sensitive issue.

The border question also threatened to topple British Prime Minister Theresa May this week, with pro-Brexit MPs from her Conservative Party threatening to oust her. She has survived. We ask our UK political correspondent, Rob Watson, for his assessment and what's next in these complex negotiations.

(Picture: A Guinness truck passes a sign for Customs and Excise on a road near the border with Ireland near Kileen, Northern Ireland. Credit: Reuters)