The King has paid a heartfelt tribute to his 'darling mama' as he and other members of the Royal Family remember the late Queen on what would have been her 100th birthday. In a new video message released today, Charles praised his mother, the nation's longest-serving monarch , and described how "she remained constant, steadfast and wholly devoted to the people she served". He acknowledged the many challenges and issues nationally and across the globe that may have caused her reason for concern,