the end of the transition period. The UK ended the transition period which ended the incorporation of European Union law into UK law, and ended its membership of the EU Customs Union, and the European Single Market at 23:00 GMT on 31 December 2020. International organisation participation African Development Bank Asian Development Bank Australia Group Bank for International Settlements Commonwealth of Nations Caribbean Development Bank (non-regional) Council of Europe CERN Euro-Atlantic Partnership Council European Bank for Reconstruction and Development European Investment Bank European Space Agency Food and Agriculture Organization G5, G6, G7, G8 G10 Inmarsat Inter-American Development Bank International Atomic Energy Agency International Bank for Reconstruction and Development International Civil Aviation Organization International Chamber of Commerce International Confederation of Free Trade Unions International Criminal Court International Criminal Police Organization - Interpol International Development Association International Energy Agency International Federation of Red Cross and Red Crescent Societies International Finance Corporation International Fund for Agricultural Development International Hydrographic Organization International Labour Organization International Maritime Organization International Monetary Fund International Olympic Committee (IOC) International Organization for Migration (IOM) (observer) International Organization for Standardization (ISO) International Red Cross and Red Crescent Movement International Telecommunications Satellite Organization (Intelsat) International Telecommunication Union (ITU) International Whaling Commission MONUC Non-Aligned Movement (NAM) (guest) North Atlantic Treaty Organization (NATO) Nuclear Energy Agency (NEA) Nuclear Suppliers Group (NSG) Organisation for Economic Co-operation and Development Organisation for the Prohibition of Chemical Weapons Organization for Security and Co-operation in Europe (OSCE) Organization of American States (OAS) (observer) The Pacific Community (SPC) Permanent Court of Arbitration UNESCO United Nations United Nations Conference on Trade and Development (UNCTAD) United Nations Economic Commission for Africa (associate) United Nations Economic Commission for Europe United Nations Economic Commission for Latin America and the Caribbean United Nations Economic and Social Commission for Asia and the Pacific United Nations High Commissioner for Refugees (UNHCR) United Nations Industrial Development Organization (UNIDO) United Nations Interim Administration Mission in Kosovo (UNMIK) United Nations Iraq-Kuwait Observation Mission (UNIKOM) United Nations Mission in Bosnia and Herzegovina (UNMIBH) United Nations Mission in Sierra Leone (UNAMSIL) United Nations Observer Mission in Georgia (UNOMIG) United Nations Peacekeeping Force in Cyprus (UNFICYP) United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) United Nations Security Council (permanent member) Universal Postal Union (UPU) UNTAET Western European Union World Confederation of Labour World Customs Organization World Health Organization World Intellectual Property Organization World Meteorological Organization World