Sir Alan Ayckbourn is about to turn 75 years old and one of his best-known plays is currently running at the National Theatre in London. Known for his acerbic social observation and exploration of human relationships, his works are as thought provoking as they are funny. But who is the man behind them? Notoriously reticent, he often prefers his written words to speak for him. In this edition of Profile, Becky Milligan speaks to Sir Alan's close friends and family to find out what drives him, and why.