The United Kingdom left the European Union on 31 January 2020.
The is part of the 2019 EU-UK Withdrawal Agreement. As a result of the protocol, Northern Ireland has in effect remained in the EU’s single market for goods. This allows goods to flow between Northern Ireland and Ireland and the rest of the EU as they did while the United Kingdom was a member of the EU. Protocol on Ireland and Northern Ireland
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a unique documentary that follows the EU’s chief Brexit negotiator over a period of some two years. A film by Alain de Halleux.
Documents of the British Government
The process for withdrawing from the European Union
Alternatives to membership …
Department for Exiting the European Union
(Speech by Theresa May, 17 January 2017). The government's negotiating objectives for exiting the EU: PM speech
(UK Parliament, April 2017). Lessons Learned from the EU Referendum