A mock-up of a rakish-looking armoured car based on a sports car chassis appears in "MG 1911 to 1978" by Peter Filby.  I've don't recall reading any suggestion that it went into production... 
 
...and flicking through an old copy of a booklet "War Time Activities of the MG Car Company Llimited" I don't see any mention of it.
		 
		
		
		
		
		
		
		
		
	
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