Nationality — Statelessness — Convention relating to the Status of Stateless Persons, 1954 — Deprivation of nationality — Involvement in terrorism as basis for deprivation of nationality — Obligation not to deprive a person of nationality if to do so would render him stateless — Determination of whether person would be stateless — Nationality under foreign law — Whether necessary to look at application of law by foreign government — British nationality — Whether deprivation of British nationality contrary to European Union law

General principles of international law — Proportionality — Proportionality in European Union law and under European Convention on Human Rights — Deprivation of nationality — The law of the United Kingdom