by Rosie Scammell Agence France Presse Britain’s Queen Elizabeth II celebrates her 91st birthday on Friday, with the world’s longest-reigning monarch taking a step back from royal duties to allow the younger generation to step forward. A gun salute at London’s Tower Bridge and at Hyde Park will mark the Queen’s birthday, a notably more low-key affair after a year of festivities to mark her hitting 90. A thousand beacons were lit around the country on […]