An independent, authoritative legal opinion from top international law expert Philippe Sands QC, showing that the renewal, replacement, upgrading and sub-strategic use of the UK's Trident nuclear deterrent may breach Article VI of the Nuclear Non-Proliferation Treaty (NPT), the UN Charter and international humanitarian law. The opinion draws on the 1996 decision of the International Court of Justice (ICJ) on the legality of nuclear weapons, the NPT and public statements by the UK government on the use and justification of its nuclear weapons.