Relationship of international law and municipal law — Treaties — Treaty not incorporated into municipal law — Whether minister required to take treaty into account — Paris Agreement on Climate Change, 2015 — Decision to designate third runway at Heathrow Airport — Airports National Policy Statement — Planning Act 2008 — Directive 2001/42/EC — Paris Agreement not taken into account — Whether Secretary of State obliged to take Paris Agreement into account — Whether taking Paris Agreement into account would give effect to unincorporated international agreement in domestic law

Environment — Treaties — Climate change — Greenhouse gases — Paris Agreement, 2015 — Whether failure to take Paris Agreement into account vitiating decision to designate third runway — Whether Directive 2001/42/EC requiring unincorporated international agreements to be taken into account — The law of England