DD turned up for an appointment to be told it had been cancelled because she had not turned up for a previous one, which she had not been informed about.
She was told the only way she could continue a treatment programme that had been going on for over 4 years with never an appointment missed, was to go back to her GP to get a referral. The GP had never been involved, because the treatment followed a hospital admission via A&E, but there was information on her notes, so he was able to write the letter. Before it had a chance to get to the hospital, they rang her up and said there had been a mistake, could she come in the following day!