I own a leasehold flat where we are supposed to have carpeting with insulation on the floors. a few years ago the person above put in vinyl flooring (apparently with several layers of soundproofing). this doesn't work well and I complained and was told "that's life in a flat". I complained to the freeholder who told me to get a solicitor-however she then had 2 very quiet tenants for the last 2 years and the noise was minimal. she now has new tenants who arent doing anything wrong but their footfall is extremely loud, and they get up all night to use the bathroom. also theres a squeaking floorboard. I want to tackle the problem again, the owner is very awkward and I want to be fully informed beforehand, would rather avoid legal action if possible-any advice on how to tackle her greatly appreciated thanks