Emlyn Williams who is appearing at the Arts Theatre, London, in three plays: "Lunch Hour" by John Mortimer, "A Slight Ache" by Harold Pinter, and "The Form" by N.F. Simpson - under the title "Three". Tonight he discusses his roles in the plays with extracts from each of them. George Chapman in the Rhondda Life in the Welsh mining valleys as seen by the English painter George Chapman.