This is my first post at this forum and I've joined the discussion late, but I wanted to point out that 2 other pilots listed above were Canadians, also. S/L Archibald John Guthrie was from Reston, Manitoba and learned to fly at the Winnipeg Flying Club. F/O John Tom Irvin Challes was from St Catharines, Ontario. Gary's pilot, F/O William John Macrae, was from Regina. [Ref: Canadians in the Royal Air Force, by Les Allison.]
In addition, W/C John Francis Griffiths, who went along on the 14 Dec 1939 recce by 99 Sqn Wellingtons against Heligoland and Terschelling Islands, also was a Canadian (from Stamford Center/Niagara Falls). He was a graduate of Canada's Royal Military College at Kingston, Ontario. On the raid he flew with S/L McKee in N2958.
-David