Hi Petermcgarry
You can send information for your appeal up to three weeks before the Tribunal takes place. However, be aware that the point of the Appeal is to see whether the DWP made the correct decision at the time of your assessment. If the mental health nurse can provide information confirming the difficulties when the assessment took place then it will be considered. Same for the issues with your knees.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
