I found the Canadian National Archives incredibly helpful and they sent me copies of all the army records I requested promptly and quickly. I requested the attestation papers from the information supplied in the online index. I didn't need to supply any further information. I haven't sent for any of the court-martial records so I don't know what information is contained in those records.
I don't know anything about the Canadian Government, as in the Ministry of Defence. I would think they would refer you back to the National Archives for First World One army soldiers records. If a soldier's records from the archives proves helpful, the Ministry of Defence might be able to give a slightly more up to date address for the soldier, but its still going to be a very old address.
Sergeant Frank Taylor was court-martialled for something to do with guarding a prisoner or prisoners. Since the court-martial was in 1919 he may still have been in this country as he was obviously still in the army in 1919.
His attestation papers say he was born in Scotland (most Canadian First World War soldiers seem to have been born in Britain somewhere). He could of course have left Scotland when he was very young. He was born there in 1893 and lived in Winnipeg Manitoba. Does any of this information make him seem a likely candidate?
I have used Canadian researchers in the past and I have found them, efficient and thorough and actually cheaper (at the time) than their English counterparts.
It does say on this website that the last soldiers from the Kinmel Park riots (who were sentenced to 10 years) were allowed to return to Canada by November 1919.
http://www.busybus.co.uk/answer1.htmSomebody I suppose had to guard them?
Regards
Valda
P.S. my surname is very much Buckinghamshire in origin, but my paternal line left the county in 1844 and we haven't been back since.