The top front door seals are an age old problem on the Defenders.  They droop and water gets in.  You can try crimping them a bit tighter to keep them up but if they are really loose then I'd be looking at a warranty replacement.  My rear driver's side door was done for that reason (lower part of seal).  Both my front doors do work loose to a degree, but then they are not any worse than my 11 year old Tdi Defender.
One other thing you will encounter which I don't believe any Defender owner has successfully fixed is the rear door windows will rattle open slightly over time and need winding up. They will drop up to a couple of cm's if not checked.
At the end of the day there is still the joy of driving a Defender.  Enjoy that part at least. 
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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