Around about the same time I was walking through Green Park one summer evening when I arrived at the Mall to find that the police had stopped the traffic because the Queen was going from Buckingham Palace to Lancaster House. I waited, completely on my own, on the pavement as a couple of outriders drove ahead of a large limousine with the royal standard on top. It was one of those vehicles which has been designed so that the people outside it can see the people in it. The Queen and the Duke of Edinburgh smiled at me – not at a crowd but at me – and waved. I smiled and waved back.
All heads of state are equally concerned about security. But all heads of state also have a duty to be seen. It seems the Queen understands this better than the Obamas.