The broadcaster Emma Barnett is a seriously tough interviewer. In my fevered mind’s eye, I imagine her home life consists of her gleefully sucking the marrow from hapless politicians’ bones. She’s quite the contrast from Jenni Murray and Jane Garvey as the new main presenter of Woman’s Hour. Murray – very much Dame Jenni these days – long ago underwent an apotheosis from mere broadcaster into treacle-voiced national institution. Garvey, meanwhile, steadfastly projects sanity and ordinariness. There’s nothing ordinary about Barnett – though I wouldn’t rule out her ending up a national institution. “If I may,” is a phrase she uses quite a lot, when speaking to guests or introducing items. Never was there a more phatic request. One senses that Barnett doesn’t ask permission for much. Nor should she.