Just to add to the post about getting the report, at the moment you are worried about items in a report that will become a legal document once issued.
at the moment everything you are concerned about is not actually a problem because nobody has provided you with any document to say it is.
these issues MAY be a problem that the contractor is willing to write down on a legal document that could later be scrutinised, however they may Not appear on the report (if they are just trying to drum up a little extra work)
In any case once you have the report, you can give a copy to any local spark to quote for doing the remedial works, there is no obligation to stay with the same contractor.