The CWWGC will sometimes alter head stones if a case can be made. there is a chance he may have ended up at or near Orpington. There is a lot of connections bettween here and Candaian military. The local hospital has the Canada Wing, a gift from the people of Canada as a thank you to the area for medical services rendered during both wars. The Britiah NHS tried to sell the site for housing a few years ago, much local dispute, finally settled by the Canadian goverment reminding the NHS just WHO owned the building. try contacting the National Army Musuem at Chelsea London. They have a number of Commonwealth war diaries.