They aren't technically my neighbours but our (small) back gardens back on to each other.
My neighbours have installed a sound system in a wooden gazebo which is against the shared fence, roughly 10 feet from our house. I'm not sure what sort of stereo it is, it has big speakers, like a mobile dj would have. The gazebo is closed on 2 sides and has an electric supply/lights.
Last Sunday they started playing loud dance music out there just after 9pm, so loud that even with all doors/windows/internal doors shut, it made water ripple on the opposite side of my house. This woke up my 7yr old and kept her up, so with it being a school night I went to ask if they would mind turning it down.
They basically told me that I couldn't have a problem with the volume as it was before 11pm, and they could have it as loud as they like until 11. They went on to say that if they wanted they could play loud music until 11pm every night as that was the law. Fortunately just after 11 they turned it down - it was still very audible but DD managed to get back to sleep, I'm not sure when they turned it off as I fell asleep with headphones in. This was repeated another two times during the week.
Is it right that it's perfectly legal to play music outdoors until 11pm, even at such high volume? I'm ready to be told I'm a moaning killjoy. DD is shattered, her room is already on the opposite side of the house so I can't move her any further away.