| Then its the owner of the flat to go after first. If that doesn't work, then check the lease and warn him you'll go to the freeholder. He may be subletting against the terms of the lease in the first place.
You can call the police on them at that time though, and I wouldn't think twice about it.
In reality, property law is a shit show and its pretty much impossible to go down the legal route unless you're a billionaire.
Sorry to hear about that Mark, its fucking terrible. I have a lot of noise from upstairs sometimes, and for a year or so it was driving me to destraction. I've trained myself to not let it bother me, although if I end up letting this place I'm goign to get it soundproofed to the tune of 5 grand, just for my own peace of mind...
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