Reaction to Sir Martin Sorrell's return with S4 Capital

As expected, Sir Martin Sorrell will return to the industry, although perhaps most people didn’t expect him to do so quite so quickly, less than two months after exiting his post at his beloved WPP.
His return as executive chairman of S4 Capital, which has just completed £51m of equity funding (most of which has been invested by Sorrell himself) will see him likely go head-to-head with his former business, of which he is a shareholder, as he aims to build a multi-national communicati