On both the mk1 and mk2 Canadian, the hull and accessories are all BSF. The engine and transmission (and likely the rear axle housing) are north american threads (UNC or UNF). The 4 bolts holding the upper angle over the radiator/division plate could be either BSF or UNF.
The only threads on the front armour that I can think of are the window mechanisms and perhaps the cover over the gunners port. They will all be BSF.
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