Just a thought. Is it a Carrier WD?
			 
			 
			
		
		
		
			
			Do you think the Stuart T226267 might be a typo. According to a "Chilwell" list I have it states:- 
 
T226038 - T228466 ( cont. T.12399 ) Carrier, 3" Mortar, No.1 Mk II, Wolsley 
 
Admittedly not all of the  numbers may have been used. Perhaps one of the Carrier experts could confirm? 
 
Cheers 
Kevin
		 
		
		
		
		
		
		
		
		
	
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