Sub-section (1) allows the Crown to implement United Nations Security Council resolutions without the official approval of Parliament.

Subsection (2) refers to the jurisdiction His Majesty's dominions, and has been amended over time as the United Kingdom has ceded legal control of its colonies.

[3] This enabled the High Court of Justiciary to sit in a bench trial of Abdelbaset al-Megrahi and Lamin Khalifah Fhimah for the bombing of Pan Am Flight 103, at Camp Zeist in the Netherlands.

[8][9] On 27 January 2010 the Supreme Court of the United Kingdom, in the case of HM Treasury v Ahmed held that The Terrorism (United Nations Measures) Order 2006 and Article 3(1)(b) of The Al-Qaida and Taliban (United Nations Measures) Order 2006 were ultra vires and void, because the 1946 Act was not intended to authorise coercive measures which interfere with fundamental rights without Parliamentary scrutiny.

[10] On 4 February the Court refused to stay the effect of its judgement until Parliament could change the law.