Judgment of the Court (Sixth Chamber) of 26 June 2001 in Case C-173/99 [reference for a preliminary ruling from the High Court of Justice of England and Wales, Queen's Bench Division (Crown Office)]: The Queen v Secretary of State for Trade and Industry (Social policy — Protection of the health and safety of workers — Directive 93/104/EC — Entitlement to paid annual leave — Condition imposed by national legislation — Completion of a qualifying period of employment with the same employer)