Competition – Competition and Markets Authority. On the first occasion challenging a warrant under ss 28 and 28A of the Competition Act 1998, the Court of Appeal, Civil Division, held that any judge considering an application to set aside or vary a warrant was obliged to consider all relevant material, although some of it might be subject to public interest immunity (PII). The appropriate time to form a definite view as to what was protected by PII was upon an application for the warrant to be varied or set aside and the use of a confidentiality ring in competition cases had no place in relation to material protected by PII.