By Michael Holden and Kate Holton LONDON (Reuters) – Britain, world leaders and royalty from across the globe will on Monday bid a final farewell to Queen Elizabeth, the last towering figure of her era, at a state funeral of inimitable pageantry. At 6.30 a.m. (0530 GMT), an official lying-in-state period ends after four days in which hundreds of thousands have queued to file past the casket of Britain’s longest-reigning monarch at London’s historic Westminster Hall. They, like many across the globe including U.S. President Joe Biden, had wanted to pay tribute to the 96-year-old who had spent s…