Horn has stopped working in the car for one reason or another.

I've checked the fuse (number 28 i think!) and thats fine.

Whats the best thing to check or do, as obviously im not too mechanically minded and am wary of the airbag. Could it be a wiring problem or could the actual horn have broken??

The car has only done 70,000 miles and everything is in good condition. Have never known of a horn to break before!?

Any help appreciated