When Sir Martin Sorrell got himself a puppy, a red setter, he named it Savage. As our car crawls through central London, from WPP's Mayfair head office to Millbank, where Sorrell is to sit on a panel, the dog sits placidly in the back, lolling its head in the sun. The name couldn't seem less apt. When Sorrell gets out, he offers a firm handshake and urges me to be nice to the mutt. "I called him Savage, because he isn't," he says.