David, after a quick re-read of "the 25-pounder in Canadian service" by Doug Knight the date 26 august 1936 comes up as the date when the British approved the replacement of the inner liner of the 18-pounder barrel thereby giving birth to the "ordnance QF 25-pr Mark I" aka 18-25 pounder. 
 
Wim
		 
		
		
		
		
		
		
			
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				In flanders fields the poppies blow. 
Between the crosses row on row.
			 
		
		
		
		
		
	
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