M&S, Tenzing, WPP: 5 things that mattered this week and why

Sorrell and the future of WPP
It’s only six days since the ad world was rocked late on Saturday evening by the news that Sir Martin Sorrell was stepping down from WPP after 33 years at the helm of the company he founded and built up into the world’s biggest agency holding company.
Much has been written about his career, his legacy and the future of WPP. Should it be broken to extract maximum value for shareholders? What is the future of the agency holding model in a world of digital?