Lt Col Donald Patrick Shaw

"An officer fairly early in the war. I can't make out his rank at the time of the photo"

"About 1918 or 1919 by which time he had become Lt Col of the Dorset Regiment"

"Post-war. He was an usher at the royal wedding of Princess Mary in Westminster Abbey in February 1922"

Photos from Derek Turner who also provided the captions

Additional information about this casualty can be seen at:
Find a Grave and at Old Tamensians
In the latter reference see Archives section especially 1915 and 1924