By Andy Ash Operation London Bridge . That's the code name given to the plan in place for the days and weeks after Queen Elizabeth II's passing. The Queen has been sitting on the royal throne since 1952. That's the longest reign of any monarch in British history. And during that time, she has seen over a dozen UK prime ministers, nearly 20 Summer Olympics, and over half a dozen popes. The Queen is the cornerstone to the Commonwealth, the patron to almost 600 organizations and charities, and plays a pivotal role in the UK's alliance with many countries. So her passing will bring about a lot of change. Not just for the United Kingdom but potentially the world. Her private secretary, The Right Honorable Edward Young, will immediately pass a message on to the acting prime minister at the time. That message will likely read "London Bridge is down." The prime minister will then set Operation London Bridge into action. Within minutes, the 15 governments ...