The flying school located at Penhold, after it was created as a NATO training base, was 4 Flying Training School. Nearby was 41 Radar Station. After the creation of Communications Command it was the home of 743 Communications Squadron. No mention of a unit designated by a "1". But I like your idea of a flight designation, like 1 Flight of 4 FTS. 
 
Still looking, though. 
 
Cheers, 
Dan.
		 
		
		
		
		
		
		
		
		
	
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