LOL, I got an alert that somebody liked one of my posts in this thread. It's over 3 years old!
Anyhow, after going down the Environmental Health route. I kept a log, they had a word with him. This resulted in him slightly turning down the music so I could only hear it in certain rooms of the house, but deliberately playing very loud music for about an hour every day between 10pm and 11pm. Then after a few weeks he slipped back into his old loud music 24/7 routine. So I snapped and retaliated. I was given a stereo surround sound which I hooked up and placed against the party wall. Whenever he played loud music I'd put it on really loud and blare loud cheesy 80s music at him. Very immature but I figured if he wasn't going to play nice then neither was I.
This went on for a few months. One day, much to my delight it was quiet. There was a sign in the window advertising it for rent. The git did get his own back by deliberately filling my bin to the top with all his rubbish before hand though, but that was a small price to pay. I think a combination of payback from me and parking wars with other neighbours must have given him a hint.
The person that rented it off him was alright, still the odd noise, it was a local couple with a small child. He also set up his decks on the opposite side of the house against the party wall of the empty house next door to him, rather than right against the party wall next to me which reduced the noise when he did play them. We got on fine. Unfortunately I was woken up in the early hours by the police breaking his door down about 5 months later. He had a drunken barney with his girlfriend (this was quite common). She must have left, but without the child as the police were called around as they were concerned about the childs safety. They couldn't get him to open the door so they knocked it down. He had committed suicide with the child inside.
Now Mr Twatty is renting it to a hippy couple. They are really nice and get along with all the neighbours. They have 2 cars but haven't upset anyone as they park them considerately. All I get is everyday living noise and not much else. They have lived there about 2 years now. It's amazing the difference nice neighbours make to your mental health.