When I moved to NZ I rented for a bit and had noisy neighbours who played music and had parties until 7am. People kept saying to me that I should call noise control but I never bothered as I assumed they would be just as useless as I had come to expect from living in the UK all my life. Weeks of taking noise logs, etc.
Turns out that when you call noise control here, someone goes round the same time that you call and they check it out. If they agree it is out of order the person is served with a noise notice then and there. If, within 48 hours, anyone calls noise control on them again the noise control people go round again and if they agree that the noise is of an unacceptable level the police go in with them and the speakers, hifi, etc are removed and the people have to pay to get them back the next day!
No idea why there is so much red tape back in the UK, but I don't miss it. When I lived in Southampton I just gave up on relying on the council

I eventually called noise control one night at 2am. Within an hour the party had stopped after I heard noise control people going round! Winner.