WW1 service record wanted

[kingsley]

I have an old friend who would like to trace her father's WW1 service. Like many veterans, he would never talk about it and the details are vague.
Name: George Wallis Baker, born 12.8.1893? in Toronto Canada of British parents, but moved back to UK around 1900.
She was led to believe that in WW1 he joined the "Ontario Rifles" but I suspect that it might have been the "Royal Canadians" (which of course WAS a British regiment).
He then emigrated to Australia in the mid 1920s and died in 1972. His Canadian connection was very slight when he went to war as he was only in Canada as a child. Hard to believe that he could have been a member of the CEF but maybe I might post this request later in the Canadian section.
Any info would be appreciated.