There's no medical examination. The form is sent out with 20 or so questions, asking for any history or current conditions, including any food allergies. You have to give the name of your doctor, and they get a medical reference. Once you are in the reference process you will then be told your references are all ok. I'm not entirely sure they actually always get a medical reference, since it could be based on your answers in the medical form. Best to contact BA health services and ask.