The first thing to do is to start making your complaints in writing and gathering evidence of this selfish behaviour. If you can get other neighbours to corroborate your claims, so much the better.
The next time the noise starts continues after 10 pm weeknights or midnight at weekends, call the police again and make a not of the names of the officers who attend..
Finally, you should seriously think about taking out a Noise Abatement Order at your local court, and you can find out all about how to do that HERE.
The thing about a NAO is that if they continue to behave like this in defiance of an order, it becomes a criminal matter as they are in contempt of court. The next time you have to call the police they could be arrested.
If you do apply for one, it would help if you could get some confirmation from the police that they have visited the neighbour on a number of occasions and have told him to turn the noise down.
You might also think about raising this with your landlord. They are supposed to provide you with a safe and peaceful home in exchange for your rent. They should also be demanding tht the EC takes action.
Otherwise I wouldn’t count on the EC doing anything for you as this guy is a member and they probably see you as a temporary problem.