Hoax phone-ins, banned dramas, late-night psychics, a new Desert Island Discs host, apologies on Today — on the whole, it is speech that brings us radio writers alive, even though we know 70% of all listening in Britain is to music. So it is heartening to find that speech radio is growing, both here and abroad, whether in the commercial jungle or the calmer lagoon of public- service broadcasting. The word is out: talk works.