European Union (Withdrawal) Bill

My right hon. and learned Friend speaks truthfully and eloquently about preserving peace in Northern Ireland, and of the centrality of the border to that. He also says that in order to achieve that we must effectively be in a single market and a customs union. Does he accept that one of the concrete ways we might deliver that is to be in the customs union and the European economic area, which is entirely possible, as Michel Barnier pointed out yesterday?