A deal-based Brexit – featuring a “border in the Irish Sea” – looks possible but requires parliamentary vote, which is not guaranteed to succeed, on Oct. 19. Should those fail Prime Minister Johnson has to request an extension to the Oct. 31 deadline. In the meantime, there’s little evidence of stockpiling in recent U.K. trade figures for August. Those showed imports from the EU fell by 4.3% year over year in August, including a 5.5% drop in shipments of food, a 19.0% slide in imports of medicines and a 19.8% slump in fuel imports excluding electricity. A brighter spot was a 12....