Since I was the one that replace the main beam stalk, i'm probably best to comment. The horn has always been temperamental at best, but it did work. Now whether I have rewired the headlamp switch wrong, or broken the bullet connection for the horn is loose (since I did unclip it by mistake) I am not sure, but the lights work fine. It is just a case of trying to fix the issue before the MOT on Friday ... shame i'm away till then and relying on my dad to fix it.