Case C-80/14: Judgment of the Court (Fifth Chamber) of 30 April 2015 (request for a preliminary ruling from the Court of Appeal (England & Wales) (Civil Division) — United Kingdom) — Union of Shop, Distributive and Allied Workers (USDAW), B. Wilson v WW Realisation 1 Ltd, in liquidation, Ethel Austin Ltd, Secretary of State for Business, Innovation and Skills (Reference for a preliminary ruling — Social policy — Collective redundancies — Directive 98/59/EC — Article 1(1)(a) — Meaning of ‘establishment’ — Method of calculating the number of workers made redundant)