Sade is so very private, so extremely wary of the press that her friends - all of whom are bound to silence - have nicknamed her Howie, after Howard Hughes. The most reclusive British singer of the 1980s has kept such a low profile since her Smooth Operator days - one tour in 14 years - that, when we meet at the London office of her record label to hear the songs from her new album, Soldier of Love, I am the only person in the room who has met her before. It’s 10 years since her last album release,...