mak, he needs to get some help.
or move out to a detached house in the countryside.
seriously.
you can't hear them in your bedroom.
if it were me and you said you wanted to go to mediation over wind chimes you can't hear in your bedroom, in a residential/urban area, i'd tell you to bring it on, let's go to court.
because that is being ridiculous.
it's not loud, thudding music, parties, arguing, DIY at ridiculous hours, engines, illegal business being run from home, etc.
and, having lived in the countryside, there's other noise. farms don't exactly start work after 9AM and finish at 5.
wildlife and livestock make noise day and night.