Spotify Advertising launches its first UK OOH campaign this week across London. Spotify’s latest campaign aims to highlight the huge opportunity for brands to reach their audiences through Spotify Advertising across key Q4 moments like Black Friday, the Festive Season, and the New Year. To celebrate, the ‘Q4 Is Calling’ experience will see Spotify give one of London’s iconic red phone booths a festive makeover – transforming it into a miniature…