I can tell you that in such situations we are completely satisfied that legal due process has been followed. Given how difficult it is to deport people from the UK (the various Abu's for example), we have little doubt that those who do get deported thoroughly deserve it and we are happy to play our small part in the operation of a just system. If there was a genuine medical reason why the individual was not medically fit to fly that might be an opportunity for the Captain to exercise his authority. As far as I can tell you are looking to 'pull a sickie' or ask the Captain to sabotage the process. That aint going to happen.