The European Council of national leaders will decide the fate of Brexit with a decision as to whether to extend the deadline from Apr. 12. A “flextension” of up to a year has been proposed by President Donald Tusk, though a re-opening of the existing Withdrawal Agreement has been ruled out. A decision needs to be unanimous among member states, and political worries in the U.K. will prolong uncertainty for supply chain operators even if an extension is agreed. In the meantime stockpiling appears well underway. Britain’s bilateral trade surged 12.3% higher year over year in February from 7...