One thing is becoming clear to me. Authors and editors have been mistakenly pitted against each other by a self-publishing system that is not currently working. Remember in the scheme of things that self-pub is very new, only a few years old. Twenty years ago, publishers put out a selection of the best and most marketable books. Editors were well-educated and got paid a fair wage. Authors received advances and royalties.
I’d add that for UK writers, the Society for Editors and Proofreaders (SfEP) Directory is the best place to search for editorial professionals. Each editor has been vetted for professional competence through the Society (you have to be assessed to become a Professional Member or Advanced Professional Member), so it’s a pretty trustworthy source: http://www.sfep.org.uk/directory/directory.asp