Kath
To win your appeal you must show that you meet the criteria for an award, there is no other route to winning your appeal.
Your medical will not have been recorded unless you requested it to be.
If there are significant issues with the assessment report then you should certainly correct these but be aware the panel are unlikely to want to spend time talking about the report, they will be far more interested in why you meet the criteria.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
