UK retailers Marks and Spencer and Asda both announced the departure of members of their executive teams this week. For M&S, finance and operations director Ian Dyson left to jon pub group Punch Taverns, while Asda announced the exit of CMO Darren Blackhurst. And, aside from a raft of quarterly results, there was some M&A activity, with Poundland the subject of a takeover from US private-equity firm Warburg Pincus who described the firm as "an exceptional business". Here is the best of who said what this week.