The Guardian:

In the plans that exist for the death of the Queen – and there are many versions, held by Buckingham Palace, the government and the BBC – most envisage that she will die after a short illness. Her family and doctors will be there. When the Queen Mother passed away on the afternoon of Easter Saturday, in 2002, at the Royal Lodge in Windsor, she had time to telephone friends to say goodbye, and to give away some of her horses. In these last hours, the Queen’s senior doctor, a gastroenterologist named Professor Huw Thomas, will be in charge. He will look after his patient, control access to her room and consider what information should be made public. The bond between sovereign and subjects is a strange and mostly unknowable thing. A nation’s life becomes a person’s, and then the string must break.

As a loyal subject of Her Majesty, I will be very sad when this inevitable day comes but this is a fascinating article on what happens afterwards.