Originally Posted by The text of the deal
“Article 4 - Customs Territory of the United Kingdom
Northern Ireland is part of the customs territory of the United Kingdom.
Accordingly, nothing in this Protocol shall prevent the United Kingdom from including Northern Ireland in the territorial scope of any agreements it may conclude with third countries, provided that those agreements do not prejudice the application of this Protocol.
In particular, nothing in this Protocol shall prevent the United Kingdom from concluding agreements with a third country that grant goods produced in Northern Ireland preferential access to that country’s market on the same terms as goods produced in other parts of the United Kingdom.
Nothing in this Protocol shall prevent the United Kingdom from including Northern Ireland in the territorial scope of its Schedules of Concessions annexed to the General Agreement on Tariffs and Trade 1994.”