Two sources I have found.
1. Gasket under the pedal box (either clutch or brake). Fix is to replace the gasket, supplemented with a jointing compound.
2. The attachment for the bracket or hinge* at the bottom corner of the windscreen. Either the attachment to the windscreen frame or the bulkhead, but usually the former.  This is a high air (and water) pressure area, and water can leak along the thread of the screw which is tapped into the bracket/hinge. The seal under the bracket/hinge has only a very small sealing area, and is easily damaged, plus the screw may work loose and the bracket/hinge may corrode and develop an uneven sealing surface. Fix is new parts if necessary, dress the surface surface of the bracket/hinge, assemble with a gasket sealant. I would not try to round the screw through the frame or bulkhead, as if only partly successful you will provide an ideal setup for corrosion, and it will be a pig to get apart again.
* Hinge on Landrover 110 and soft top Defenders, solid bracket on Defender. Interchangeable unless you want the ability to fold the windscreen.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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