We would only need a bespoke solution for Northern Ireland if Britain leaves the Single Market.

I hope the unionist parties, for example, who would be keen to protect and preserve the Union would see that it's much easier to do that if the U.K. stays within the Customs Union and the Single Market, because that would take away the need for any special arrangement, or bespoke solution, for Northern Ireland.

What I would rather see, what I think would be the best outcome, is a very close relationship between the United Kingdom and the E.U.

Leo Varadkar Quotes