Should have added, in my case, it took a very persistent campaign by four sets of neighbours (including me) to both the council noise people and the housing association the guy was a tenant of before anything was done, and in the case of the housing association everybody we spoke to or emailed kept passing the buck, but eventually we succeeded. That was also a mental health issue and we were all also scared to approach him because in addition he appeared potentially violent. Also, the one time (Christmas Eve, four in the morning) it all got too much for me and I went to complain in person, he couldn't hear the doorbell because of the noise.