Queen Elizabeth II's 100th Birthday

In a heartfelt message, King Charles described his mother as 'constant, steadfast, and wholly devoted' to her service.

The Royal Family marked the centenary with the unveiling of a final masterplan for a permanent memorial in St James's Park.

Princess Kate paid a poignant homage by wearing two of the late monarch's most treasured pearl pieces.

The day of commemorations also included a visit to the British Museum to view models of the upcoming memorial statues.