Richard Cork (in the chair) talks with Richard Mayne , John Peter and Gillian Tindall on: Nicolas Roeg 's film Witches; Frontiers: Gold and the Gun: Nadine Gordimer on the South Africa/Mozambique border (BBC1); On Classic Ground: Picasso, de Chirico and the New Classicism (Tate Gallery); Burn This by Lanford Wilson (Hampstead Theatre); The English Town by Mark Girouard. Producer Philip French. Mono