Diary: What's on Sorrell's iPod?

Diary is excited to reveal that the mercurial Sir Martin Sorrell is set to feature on Radio 4's Desert Island Discs later this year.

The WPP boss, who famously refuses to divulge his favourite ad, will now have to tell the world what his favourite music is. The move has been greeted with shock within WPP. Not least because it is almost certain he will be quizzed on some testy subjects, including his first marriage and hugely expensive divorce settlement. As for his music choices, those hoping for some thrash metal will be disappointed. Indications are that it will be heavily jazz-oriented and almost certain to include a recording of My Funny Valentine by Chet Baker. Sir Martin, if you are struggling to come up with tunes, Diary would like to suggest anything by Tinie Tempah.