Case C-477/14: Judgment of the Court (Second Chamber) of 4 May 2016 (request for a preliminary ruling from the High Court of Justice of England and Wales, Queen’s Bench Division (Administrative Court) — United Kingdom) — Pillbox 38 (UK) Ltd v The Secretary of State for Health (Reference for a preliminary ruling — Approximation of laws — Directive 2014/40/EU — Article 20 — Electronic cigarettes and refill containers — Validity — Principle of equal treatment — Principles of proportionality and legal certainty — Principle of subsidiarity — Charter of Fundamental Rights of the European Union — Articles 16 and 17)