The individual in international law — Human rights and freedoms — European Convention on Human Rights, 1950, Article 5(1) — Detention of mentally ill person — Section 66, Mental Health Act 1959 — Recall after conditional discharge — Whether an unjustifiable deprivation of liberty — Review of legality of detention — Habeas corpus — Other available procedures for review — Whether able to secure enjoyment of right guaranteed by Article 5 (4) — Right to prompt and adequate statement of grounds of detention under Article 5 (2) — Whether aspect of complaint under Article 5 (4)