The U.K’s request to join the Comprehensive and Progressive Trans-Pacific Partnership (CPTPP) could be a tremendous boon for this bloc. The CPTPP has 11 members at present, including Canada. However, four members — Peru, Chile, Malaysia and Brunei — have yet to complete the ratification process. The U.K.’s potential accession could lead the CPTPP to develop further in response to renewed interest from present and prospective members. Canada and the U.K. have already been discussing...