A couple of years ago, the Queen revealed to a group of visiting American students that she is keeping a diary. “My husband reads in bed,” she is reported to have told them, “and so does Prince Charles. But I write my diary – and it’s far more truthful than anything you’ll ever read in the newspapers!”
It is a tantalising prospect. The Queen has been on the throne for 36 years. She has dealt with eight different prime ministers. If this monarch is anything like as penetrating on paper as she is said to be in conversation, it will be a unique insight into our times.