Appointeeship applications

Does anyone have experience of these?  We have a client whose son will shortly turn 16.  The client has applied to continue with the appointeeship for his DLA because she doesn’t feel he can manage his affairs.  She has asked us what sort of questions the DWP visiting officer will ask and while I can make a guess, I have no knowledge of what happens in the interviews.  Does anyone have any information they can give on this?

Agents, Appointees, Attorneys and Deputies Guide - DWP site:
http://www.dwp.gov.uk/publications/specialist-guides/agents-appointees-attorneys