Theresa May has told RTÉ News she will work with the Irish Government to ensure that customs union arrangements are as "frictionless" as possible after Brexit.

Earlier today, Ms May said the UK would not leave the customs union completely but would look for partial or "associate" membership of the union, a key issue for goods moving across the border with Northern Ireland.

Ms May said she had highlighted her commitment to the Common Travel Area in her speech this morning, saying it existed long before either Ireland or the UK were members of the EU.

We want to ensure free movement, she said, and wanted no return to the borders of the past.

At the end of the Article 50 negotiations, Ms May told RTÉ News she would see what had been agreed on the customs union, but what was important was that the Irish and UK governments are committed to finding a solution that would work and be practical for people on both sides of the border.