Complaining about poor health care is very important, even if you choose to change hospitals. I complained about my own diabetes clinic because I waited such a long time for a consultant review after diagnosis, with the encouragement of my DSN who was also fed up with the problems they were having. Changes aren't often made to NHS services without direct patient complaints. My complaint actually got me an appointment very quickly but that's beside the point, making the complaint, if you feel able to, is really important. I went through PALS by the way.