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Hello, my name is ***** ***** I am a qualified lawyer happy to help you today.
Have you notified your local council yet (the environmental health department)?. They have a duty to investigate nuisance such as this - they can fine and prosecute landlords. They can also give you sound recording equipment to record the decibel levels.
Yes, as they still have a duty to investigate statutory nuisance being the excessive noise. If the council cannot do anything then you can obtain the decibel evidence and apply to the local county court for an injunction (which costs £308).
Is there anything else I can help with?