In a country where Mugabe's regime ruthlessly controls all radio and television output, and where the only independent newspaper has recently been shut down, SW Radio Africa is the only independent voice. It broadcasts not from Zimbabwe but from the third floor of an office block in a grimy suburb of north-west London. And it is run not by hardened political hacks or opposition party activists, but by a group of DJs turned journalists, most of whom made their names playing pop songs on Zimbabwean state radio in the 1980s and 1990s.