Terry
I've moved your post to it's own topic, we ask members not to post their questions in other's topics as it can lead to the wrong advice being given or taken.
Just to confirm you have received an appointment letter from Capita for a face to face at one of their offices?
To get a home assessment, if one has not already been given, you will need a letter from your GP explaining in unambiguous terms why you cannot at their offices.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems