Britain is inextricably committed to the jurisdiction of European courts and always will be

The discovery that this country is still subject to European law and the European courts, as seen when the flight to Rwanda was halted, may have come as a surprise to many people, but the government knew about it. Britain can never escape the jurisdiction of the European courts for a very simple reason.
https://peacemaker.un.org/sites/peacemaker.un.org/files/IE%20GB_980410_Northern%20Ireland%20Agreement.pdf
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:12019W/DCL(01)&from=PT