Opinion of Advocate General Pitruzzella delivered on 29 April 2021.#Comité Interprofessionnel du Vin de Champagne v GB.#Request for a preliminary ruling from the Audiencia Provincial de Barcelona.#Reference for a preliminary ruling – Agriculture – Protection of designations of origin and geographical indications – Uniform and exhaustive nature – Regulation (EU) No 1308/2013 – Article 103(2)(a)(ii) – Article 103(2)(b) – Evocation – Protected designation of origin (PDO) ‘Champagne’ – Services – Comparability of products – Use of the trade name ‘Champanillo’.#Case C-783/19.