Thirty years ago this week Elizabeth II was crowned. This programme celebrates and assesses the Queen's changing role and conveys something of the nature of the job itself. It shows the Queen in London and on her recent American tour as well as key events of the reign. Special permission was given to film the Queen holding an investiture at Buckingham Palace, with her family and President Kaunda during the recent state visit, and on the Royal Yacht with Prime Minister Trudeau and President Reagan. There are comments from some of the people who have worked with the Queen or observed her -Sir Harold Wilson , Edward Heath , James Callaghan , Sir Shridath Ramphal , Enoch Powell , President Kaunda, Sir Nicholas and Lady Henderson, William Deedes , Rich. ard Ingrams, Susan Crosland and one-time critic of the monarchy John Grigg (Lord Altrincham). From the royal tour comes a rich variety of comment and behind-the-scenes activity at a time when the British monarchy is arousing worldwide interest. Written and narrated by Ludovic Kennedy