BUZZ-ITV: Lowers H1 ad-revenue forecast as Brexit weighs
** Broadcaster ITV's shares down 2.2 pct, second-largest Stoxx 600 Media loser, after lowering its forecast for H1 ad revenues
** Co says customers are holding back from buying advertising in the build-up to the British referendum on EU membership
** "We remain cautious given slower/negative momentum on ad market concerns over the EU Referendum period, structural TV concern and slower global macros," Investec (LSE: INVP.L - news) analysts write
** Shares (Berlin: DI6.BE - news) were earlier up 2.2 pct (Investec flags Q1 results in-line/slightly above consensus) (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)