The sump plate takes about 2 minutes to remove and about 3 minutes to put back on - so why would you bother cutting a hole in it.  I think with a hole in it a lot of dirt would build up under the engine.
Bbyer - on the TDV6 the oil filter is on top if the engine so removing the sump plate is to only gain access to the sump plug.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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