Mine's on it's way out - it's starting falling to bits and now when I indicate left I just get a blast of the horn - had to plan my route around only turning right now!
I've given it a quick fix for now - the wiring was OK but the actual switch seems to be coming apart.
It's a single chrome lever version. I've found a couple in the US so will find a few other bits I need and probably get one shipped over if I cant find one locally.