Derek Malcolm lin the chair) talks with John Elsom , William Feaver and Claire Tomalin. This week's subjects: The Collected Poems o/ Gavin Swart ; Pal Gabor 's film Angi Vera ; Travelling North by David William son at the Lyric Theatre, Hammersmith; Patrick George at the Serpentine Gallery; the Radio 4 play Now and at the Hour of Our Birth