I mentioned it on my PIP application.
If you haven't seen this PDF before I really really recommend it: http://www.lampdirect.org.uk/sites/d...sment_form.pdf
It gives examples of some of the indicators related to mental health for each question, and it's a really useful prompt for helping you to describe your difficulties - there are a lot of things I hadn't really thought of which can be relevant. Things like feeling so low that you don't cook or eat properly, thoughts of hurting yourself around mealtimes, need for supervision or support with medication due to risk of self-harm or previous ODs, all sorts. I really really recommend having a look through it.