J. H. Middlecoat, a Canadian repatriated with the Americans in June, tells the Winnipeg Tribune (page 13) that lack of food was the main difficulty in Stanley, that he saw no internee being mistreated and had no first hand knowledge of Japanese atrocities. He also says that he'd learnt from the doctors who visited the camp that the POWs in Kowloon were getting roughly the same treatment as the civilians.
Note:
J. H. Middlecoat was one of the 'European' drivers who in the SCMP for December 23, 1941 were requested to either present themselves for duty with the Auxillary Transport Service HQ at the Stock Exchange Building or ring in to say they were already driving for a civil defence organisation.
My guess is that he was careful with his comments to the press for fear that harsh criticism of the Japanese would bring about retaliation against the remaining internees, as had been threatened.
Some Canadians were repatriated with the Americans in late June 1942. Middlecoat had been an agent with the Canadian National Railways, and it seems that it was largely commercial staff who were allowed to board the Asama Maru. Gwen Dew notes that he was one of the internees who was chosen to be on the American-Japanese exchange even at the stage when it was not planned to include all Americans. She mentions another Canadian as part of this earlier plan, a Colonel Doughty 'who had done extraordinary work as Food Control Chief during the war' (http://archive.org/stream/prisonerofthejap007029mbp/prisonerofthejap007…). Although I don't doubt Doughty's contribution, he's one of a number of people who are named by one source or another as in charge of Food Control. The official head was the banker A. C. Meredith.