The key takeaway from this event is that Operation London Bridge was planned well in advance of the Queen's death and was revised over the years to keep it current and relevant. The plan was comprehensive, including all details from the death announcement to the details of the State Funeral to the duration of the mourning period. They even included a plan outlining actions to be taken should her death occur in Scotland (Operation Unicorn).
How can we learn from this event? The first and most important lesson is that a succession plan is an essential part of any business. The plan must also be looked at frequently, revised when needed to keep it up-to-date, and include implementation and communication details for all affected parties.