Where do I stand on 'suitability' query?
The correct response to this is: you are not in a position to give any information without the fully informed consent of the person to whom reference is made.
The college should make its own inquiries, and it has the final decision about whether a person could undertake one of its courses.
Should the college wish you to act as medical examiner on its behalf and you are willing, then a fee can be negotiated to provide this information.
The college must be told it is no part of your duties to send such information without ensuring you have the fully informed consent of the patient. And you must be free to make such examinations as you consider appropriate and to charge for your time for this function.