Spero - the hospital were not expecting Ashya to be discharged, the plan was for him to have several weeks of chemo. Therefore it is unlikely that the hospital had done any home care training of Ashya's parents for any care Ashya may need when discharged.
You can't as a professional, assess a parent as competent in a clinical skill, if the parent has not been taught that clinical skill, nor been witnessed the parent doing it.
You can't assume someone is competent and the hospital is quite right not to have made that assumption.
Yes, Ashya was OK, but things can go wrong, the judgement makes particular notice of his absence of a gag reflex, things could have gone very wrong here.
As for Ashya not staying in HDU for long, he wasn't in HDU in the UK, just on an oncology ward, he's stable awaiting treatment, but he has been transferred directly from a Spanish hospital to a Czech hospital.
With regards to communication at the hospital, when having important conversations with parents, it is best to always ask the parent what they've understood from the conversation, so you can be that you are both in agreement as to what has been discussed and what you both understand has and will happen.
The thing is, we don't know the conversation, in terms of what was said and how. If the conversation was as heated as Mr King says, the hospital should have taken action to resolve that, arranged a multidisciplinary meeting with the Kings to go through all the options and explain all the possibilities.
Questions will be asked as to whether those involved in Ashya's care were aware of the extent to which trust had broken down and how they hoped to deal with that.