谁也不能保证欧盟会同意暂时延续自由贸易，而且似乎可以肯定的是英国对第三国的出口将面临较前欧盟伙伴更高的关税（导致英国出口商处于竞争劣势 ） 。
There is no guarantee that the EU would agree to an interim continuation of free trade, and it seems certain that UK exports would face higher tariffs than its former EU partners in those third countries (placing British exporters at a competitive disadvantage).