Hello, I think you can contact Southwark noise nuisance department at the council. They do come out and listen to the noise and issue a warning, take away equipment and issue heavy fines. On one occasion when our daughter and her friends were having a rock concert in the garden ( yes ) on a Saturday afternoon and the chap turned up with the clip board - I hid and thought well if he does call the police it will be hours and the concert will be over. Within about 5 minutes we had about 7 police in stab jackets in the front garden and I had to take responsibility for it. I now have a notice saying if I do it again it will cost me ?1000. This was a fairly calm respectable party so you could get a really good response. Might do the trick. Otherwise get or borrow a large dog.