Hi Adele
The DWP should judge your review on the most recent form. You can write as much as you need to on separate pieces of paper and include them with the form. Just make sure that you have your name and NI number and the question number on each piece of paper. You can also include a copy of your last judgement at the tribunal.
How much do you write? It is up to you. Some people write very little and some people write a lot and act as if it was the first time they had put in for a claim. Have a look at the section in our Guide to PIP claims and reviews and the guidance on completing review forms.
benefitsandwork.co.uk/guides-for-claimants/pip BIS