UKPassats

Here is the problem, last night both front lights worked fine. Tonight both front headlights, mainbeam and dipped beam stopped working, main beam will only work if l pull the stalk in as for flashing, other wise dead. The only lights that work are the 2 little side lights. I have checked fuses and they all seem fine. Could it be the main switch or a relay. Has anyone else had this problem.
Clint
Passat B5 1.8 (1998)