Sir Martin Sorrell steps down as chief executive of WPP

Sir Martin Sorrell, chief executive of the world's largest advertising agency network, WPP has resigned from his post following an investigation being held by the company. 
Both WPP and Sorrell released statements on Saturday evening (14 April) to announce the decision, alongside the move to make Mark Read, chief executive officer of Wunderman and WPP Digital, and Andrew Scott, WPP Corporate development director and chief operating officer, Europe, to become joint chief opera