evidence: The Protocol on Ireland/Northern Ireland is an integral part of the Agreement on the Withdrawal of the UK from the EU, an international treaty agreed between the UK and the EU setting out how the UK’s exit from the EU would work. Its main provisions came into effect on 1 January 2021. [...] The Protocol provides that Northern Ireland is legally part of the UK customs territory, but is subject to certain specific provisions of EU law agreed with the British Government. [...] The provisions of EU law made applicable in Northern Ireland by the Protocol are contained in a series of annexes to the Protocol itself. Where these provisions of EU law are amended or replaced, those changes will also apply to Northern Ireland.