I've had a similar issue on a Nissan GQ Patrol a couple of times. It was the actual switch contacts in the headlight stalk coming off the steering column. I took the switch unit apart and cleaned the contacts, spread the electric grease around a little and hey presto it worked again. No guarantee it's the same thing on a Land Rover but might be worth a check.
Another thing to check would be the earthing of the headlight circuit. A problem common to both lights could well be earthing related.
Best of luck chasing the electrons.
John B


				
				
				
					
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