S4 Capital: 5 things you need to know about Sir Martin Sorrell's post-WPP venture

Following a month of tumultuous media coverage over his shock WPP exit and subsequent allegations of "personal misconduct", Sir Martin Sorrell made a big comeback at Cannes Lions – discussing not only the "press frenzy" but also giving some juicy details on his new venture, S4 Capital. 
A day before he graced the main stage in the Palais, the advertising luminary appeared in The Drum Arms pub for a sit down with our editor Stephen Lepitak.
Here, he divulged some more details on h