From personal experience, I had an issue I wanted dealing with/monitoring once. Had initial check at inconvenient hospital, said I'd prefer my more local one next time, which was apparently fine. Got a letter in the post to say there was an appointment at the inconvenient distant hospital, I replied that wasn't convenient so I couldn't agree. Happened twice more. Clearly no appointment had been agreed so none had been cancelled, but at this point I discovered the lying NHS had been marking these suggested date/times, that they knew full well were unacceptable, as me cancelling an appointment that had never been agreed in the first place. Unbelievable abandonment if duty/care. So they refused to do the job they were paid for, i.e. continuing to monitor/treat the issue. So beware, they don't care and are happy to mess you about then ignore you.