Hi - don't know if this is possible ,but mediation works on the basis of making a contract ,a deal with both sides gaining something. Could you approach them by suggesting that you realise they must hear noise from you and is there anything in particular that they find irritating that you could tone down ? And then obviously move on to the noise they make ..... I know ,they'll probably shrug their shoulders at your opening gambit . Anyway ,horrible for you - try Southwark Mediation.