I decided he'd changed so much that a whole new book was required and that book actually I can say so was the first to say that the marriage was in trouble and the Prince didn't like at all and my book was being serialized in the Sunday Times over five weeks.

It's a problem for him because he's got - like Edward VII had - nearly all his lifetime to wait until he becomes Monarch. What is he going to do with it? So he wants to do something positive but he always courts those dangers.

I remember a moment when the Prince went back to his old school, Grammar School in Melbourne, and slightly to his horror his old music teacher produced a cello.

Well the wedding in the words of the Archbishop of Canterbury was a fairy tale and there was a huge public impress, investment of goodwill, affection and indeed money in this Institution. It was a huge success at the time.