Retirement doesn’t suit Sir Martin Sorrell, but making a point does

The former WPP millionaire has a new media startup and is the latest mogul who won’t go gently into the nightSir Martin Sorrell spent more than three decades building his first empire. He has given himself five years to create his second. Within weeks of being ousted from WPP, which he built from a small Kent-based maker of wire baskets into the world’s biggest ad group, Sorrell began plotting his return.Last week, he announced the reverse takeover of another small lis