'In 1969 I had a letter from a producer in BBC Radio saying he'd fished out an old script of mine from a pool and though it might have possibilities for a radio play. I liked the idea of a producer at Portland Place dredging up drama from a pool of old paperwork, but he was six months too late, and I smugly wrote back, to point out that the play in question, Forty Years On, was already running in the West End.'