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So in essence the noises they are complaining about are ordinary noises which are not above the normal sound levels expected?
I understand, generally a private nuisance must be out of the ordinary, it is not always the case but is a good guide and even where it has not been held to be the case it is very much exceptional such as very noisy children running up and down on wooden floors all day. Therefore, I do not feel you need to pay the cost of he noise insulation if you agree to it and you do not have to agree to it. I trust this assists you in understanding your position however, should you have any supplementary inquiries, do not hesitate to ask and I will look to clarify or expand on my previous response.