The U.K. exited the EU customs union following the 2016 Brexit referendum, formally leaving the bloc in January 2020 under the leadership of then-Prime Minister Boris Johnson. During a transition phase, Britain stayed aligned with EU trade regulations before fully departing the customs union on January 1, 2021, when the EU-U.K. Trade and Cooperation Agreement became active.
This change restored Britain’s capacity to negotiate independent trade deals but also introduced customs checks, rules-of-origin requirements, and new barriers for exporters.
Prime Minister Keir Starmer has currently ruled out rejoining the customs union, labeling it as a non-negotiable boundary while committing to a broader “reset” with Brussels.
“We are getting a closer relationship with the EU on a number of fronts, including on trade and the economy,” Starmer informed MPs earlier this month, stating: “We have clear red lines in relation to the single market and the customs union.”













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