"[2] (Offences involving nuclear weapons are dealt with under the Anti-terrorism, Crime and Security Act 2001.)

Section 1 of the Act implements Article 7 by giving the courts of England and Wales, Scotland, or Northern Ireland the jurisdiction to try certain offences (such as murder and robbery) even if they were committed outside the United Kingdom by people of other nationalities, provided that the offence was committed "in relation to or by means of nuclear material".

Section 1 was amended by the Criminal Justice and Immigration Act 2008 to extend the courts' jurisdiction to try certain offences if they were committed by doing an act directed at a nuclear facility which causes death, injury or damage as a result of radiation or the release of radioactive material, even if done out of the UK and irrespective of the nationality of the person doing it.

Section 1B, inserted by the 2008 Act, makes it an offence for a person of any nationality, and whether in the UK or not, to receive, hold or deal with nuclear material, or do an act directed at a nuclear facility, intending to damage the environment or being reckless as to whether the environment will be damaged.

Section 3 requires that an offence which would not already be an offence but for the Act may not be prosecuted in England and Wales without the permission of the Attorney General for England and Wales, and may not be prosecuted in Northern Ireland without the permission of the Attorney General for Northern Ireland.

Section 7 authorises the Queen (by Order in Council) to extend the Act to the Channel Islands, the Isle of Man and any British overseas territory.