my horn does not work, fuses are ok relay clicks and ibhave also tried other relays but no voltage at horn end is there any joins in the middle?.
i also have a problem with the headlight adjusters they dont work and it has failed the mot on them also. can any body help?

 

You may want to check the horns themselves- the "trumpet" of the horns (there are two of them) open up facing forward as one would expect. The are just behind the grille so rain/dirt/debris/etc. can get in pretty easy. I had the same issue and replaced both of them with some aftermarket Hellas mounted on a simple bent metal bracket I made.

 

I recently went through my headlights and replaced broken adjusters. I got parts from Atlantic British, though Amazon had them too.