Canadian Army Abbreviations WWII

I am attaching scans of a cover addressed to Scotland. The front bears the stamp (Barely legible) of FPO 248 dated Jan 9 1943. This was used by Canadian Reinforcement Units , Whitley from 1940. The British 3d stamp was issued in November 1941.
The address on the reverse is from M29607 Sgt Ironside W M, from 810CD - MD13. There are a number of suggestions for "CD" of which Canada Draft look a good fit and MD13 is from Military District 13, Alberta.
Was 810 the number of the draft and was Sgt Ironside part of that draft?
Any ideas?

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Alan - sorry I cannot help. I haven't come across anything like this before.
Mike