We are next to a HMO and the three early 20s living there have been pretty irresponsible since they moved in, and two weeks in a row they have had loud parties keeping my husband up (I am in the baby's room at the moment so don't hear them). He called the police at 5am. How would you have reacted? Ring the doorbell at 5am, ask them to turn it down, talked to them the next day? I am much more scared of conflict than he is and would probably have done nothing, but he just had enough. I was pretty shocked when he told me this morning. No point in contacting their landlord as the flat is owned by notorious Mark Fortune... sigh.