The Queen's funeral: who, what, where, when and why?

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This is a mammoth logistical operation. The world's most powerful political leaders will be taken, by bus, to Westminster Abbey for Britain's first state funeral since 1965. What might the fly on those walls hear and see as presidents, prime ministers, and heads of state mingle ahead of the funeral of Queen Elizabeth II? And what goes into preparing such a star-studded guest list? Image credit: Jeff Over, BBC