Opinion of Advocate General Bobek delivered on 11 June 2020.#UQ v Marclean Technologies, SLU.#Request for a preliminary ruling from the Juzgado de lo Social de Barcelona.#Reference for a preliminary ruling – Social policy – Collective redundancies – Directive 98/59/EC – Article 1(1), first subparagraph, (a) – Concept of ‘collective redundancies’ – Methods of calculating the number of redundancies – Reference period to take into account.#Case C-300/19.