Had a similar prob on my Disco, albeit a SI. In my case it was the switch unit, activated by the stalk. The stalk pesses on a little plastic spring loaded pin which moves from side to side which each activation of the stalk, switching from high to low beam and reverse. This little pin can wear and become dislodged, effectively blocking either high or low beam. The cure is to replace the switch (unfortunately they are a rather costly item), although you can take it apart, fix the pin and continue using it, it will only be a matter of time until trouble starts again. Usually when you are in dire need of the car and will have no time to fiddle with it.
Hope this helps.
Cheers
Johannes
There are people who spend all weekend cleaning the car.
And there are people who drive Discovery.
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