Human rights — Fair trial — Right to a fair hearing on the determination of civil rights and obligations — European Convention on Human Rights, 1950, Article 6(1) — Rights granted by public law — Social security system — Hearing before social security courts — Whether Article 6(1) applicable — Outcome of case before courts would determine existence of rights — Failure to ensure that trial took place within reasonable time — Whether denial of rights under Article 6(1)

Treaties — Interpretation — Principles of interpretation — Vienna Convention on the Law of Treaties, 1969, Articles 31 and 32 — European Convention on Human Rights, 1950 — Need to interpret treaty in light of changes in social conditions