The serious answer to the question "Why do Defenders leak?", is more or less as follows.
The basic design (1948) was not intended to be watertight, as it was a working vehicle, in a time that if you worked in the rain, you accepted getting wet. (Remember that at the time no Australian made car had a heater, for example, and it  was illegal to drive with the driver's window shut, as you needed to make hand signals.) In 1948, any form of roof was optional, as were door tops - and door seals were not even optional.
Since the basic design has not changed, sealing has had to be more or less improvised to add to the basic design, rather than being designed in from the start. The design aspects that lead to sealing problems are:-
The body is bolted together from a large number of separate components. This enables the wide variety of different bodies, but every bolted join is a potential leak.
Being designed to need minimum tooling means that door openings etc have sharp corners. These are very difficult to seal. 
The usual source of leaks onto your feet are - water coming through the bolt holes for the brackets at the base of the windscreen; faulty join between the clutch or brake pedal assembly and the footwell; Damaged or missing rubber plugs in redundant holes in the bulkhead; rust holes in the footwell. Vents are often blamed, but rarely the real culprit. Door seals a little more often the problem.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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