The U.K. government’s new Internal Markets Bill is needed to ensure continued trade between the four countries of the United Kingdom after current trading rules with the EU end. It also brings an unwelcome complication of allowing the government to deviate from the Northern Ireland Protocol in the event that no trade deal with the EU is reached. The government’s move will further worsen relations with the EU just as the deadline for completing a deal approaches in mid-October. Should there be no deal then non-EU suppliers to the U.K. may be able to rebuild their market share versus EU ex...