The formulation of post-Brexit trading arrangements appears to be making little progress. There is significant discord within the British government, with one group of ministers – so-called “Brexiteers” – rejecting the government’s preferred “customs partnership” approach. Unless customs arrangements are resolved well ahead of the U.K. leaving the EU in 2020 there is a risk of significant supply disruptions. Britain’s ports, led by Europe-centric Dover and Southampton – can ill afford that. Total shipments handled fell 1% in 4Q 2017, a second quarterly contraction after four years of gro...