Derek Malcolm (in the Chair) talks with Blake Morrison , Benedict Nightingale and Hilary Spurling. This week's subjects: Going Gently, a film for television by Stephen Frears yesterday on BBC2. Thomas Otway 's play The Atheist on Radio 3. John Arden 's Serjeant Musgrave's Dance at the National Theatre. New paintings by Bridget Riley at the Rowan Gallery. The Liberal Imagination and Of This Time, Of That Place and other stories by Lionel Trilling. Producer PHILIP FRENCH