Environmental health is the way to go.
Log each instance of noise, when it starts, how long it goes on for and what it is (ie stereo, TV etc)
Get friends, neighbours etc to witness the noise and mark on the log who is present at that particular incident.
Most councils are very hot on this and can issue abatement notices on the spot if you call them when it is in progress.
Police will only attend if the noise is causing a real breach of the peace, ie neighbours arguing or smashing each others windows.
Good luck - don't be forced to move if you don't want to, EH should fight your battle for you.