Dixi
You don't need to take the aid or the pillows to the assessment, if he has stated that he needs to use them in his PIP2 then it should be accepted that he does.
To Show that he needs to use them he needs to explain the problems that he has / would have if he attempted to complete an activity without them. So as an example, if he has problems holding vegetables when preparing a meal, then he should explain what those problems are and why he has them and how a suitable aid overcomes those issues or does not as the case may be.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems