Being an EHO and having had complaints very similar to this one to deal with I have sympathy for all concerned, the target of the complaint, the EHO in question and the complainant.
Life is not simple and no doubt the EHO felt that there was a justifiable complaint, before issuing the Notice.
I must admit my colleges and myself have found more amicable solutions to our similar complaints. Generally we have contacted family, Social Services, Area Health and other medical or charitable bodies and so far not had to issue notices to alleviate what have been serious problems for the neighbours. I agree with Mo, some of the modern houses, flats etc are built with little regard to possible noise problems. Many older Semis and terraced houses also have similar structural inadequacies in preventing the transfer of sound from one dwelling to another.
I also have sympathies for the views of The Shambles in this and other threads.
Many times the local EHO is placed in extremely challenging situations and cannot always find a solution to problems that satisfy all concerned.