Hi Mariababy
When you fill out the PiP review form, even if there has been no change in your circumstances we advise that you still put in some information reminding them what exactly hasn't changed because they need an up to date picture. That doesn't have to be lengthy, but it's better than writing nothing.
It's up to you whether or not you want to include your past form. Medical evidence and a support letter from carer always useful.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems