Clarzie
Unfortunately, if a face to face is required then you must attend or you risk your claim being closed.
You can speak to your GP to see if they will write to Maximus in support or a home assessment or even a Paper Based Review, their letter will need to be unambiguous about your inability to attend or the risk of harm to you if required to have a face to face.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems