Advice please - Should the school have asked me for consent before contacting child's hospital?

My child has SEN and medical condition. We have a health care plan set up with the school which tell them what to do in an emergency. It also has contact information of his hospital. Care plan clearly states that the hospital to be contacted in an emergency only . I dropped off some emergency medication at the school office for him. My conversation was already taking place for the hospital to come in and do staff training. Before we finalised how we going to arrange training, the deputy head took the opportunity to call the hospital to say they don’t feel comfortable administering my child and that they would like to book the training. While on the phone the school also talked about my child’s attendance with the hospital. I raised complaints , that this has happened behind my back and I want written statement from the person who contacted the hospital . But school apologised and said they only called to discuss medication and book the training, nothing else . However I received written statement from the hospital that said school raised concerns over my child’s attendance and it was briefly discussed.
I am now at stage 3 on the complaint , which means I have meeting with governors to discuss why I escalated the complaint.
I know that they took the opportunity to contact the hospital to talk about his attendance.
-I would really appreciate if you can advise me the law that might imply to this situation?
-Was it lawful for them to contact the hospital to discuss all this ? Or they should have contacted me first for my consent .
-What should I ask for the outcome to this meeting ?
Sorry for the long post 🙏🏽