Pip woes

My husband lost everything on tranfer from DLA high rate care & mobility indefinite award.
The assessment ignored multiple evidence reports and letters sighting cognitive impairments & minor but multiple physical disabilities.

Mandatory appeal was refused.

We put in for the appeal also at same time applled for me to get power of attorney/ DWp appointee statue for him. This has been granted should I send this to the tribunal as evidence of the assessor lies as to no mental health or cognitive impairment?