Adult Disability Payment is extra money to help you if you have a disability or long-term health condition that affects your everyday life. I believe this is only paid in Scotland which is taking the place of PIP. www.mygov.scot/adult-disability-payment
As this is new, I cannot tell you if this is routine, I would always advise someone to take a friend/family member with them whenever they are ask to attend a office in person, they could record the meeting on their phone undercover.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems