Not really AIBU but need advice in case it happens again.
I was woken up about half an hour ago by some loud shouting outside. I looked out the window and a group of about 6 youths (maybe aged 14-15) were on the roundabout just outside my home. They were banging on the road signs, and shouting at passing cars 'honk if you're horny', using the road sign pole things to 'pole dance' to traffic, and running out in the road to moon passing vehicles 
It was causing cars to hoot at them and shouting from drivers, making the noise even worse. I tried to call the police on 101 to report it, but was on hold for 20 minutes. Eventually the youths left so I hung up before I was out through to anyone.
What is the best thing to do in this situation? It takes a long time to get an answer from 101 but surely this isn't a 999 scenario?