?234 for diagnostics? Ouch. Lakeside VW told me that inspection / diagnostic work is always ?50 then they'll advise if more work is required - sounds like you might be better finding an independent? I'd heard that each headlight unit (I'm guessing you've got bi-xenons) costs ?1000 - but there may come a point when its cheaper for you to buy a second hand set from a breakers yard or something. Would be interested to hear the outcome of the diagnostic.