Paul
It sounds as if your award is being reassessed, does it end in December 2020?
The form is likely an AR1 Review form, is it labelled as "1043"?
Our PIP Clain guide has a section on the form
www.benefitsandwork.co.uk/help-for-claimants/pip If you have any specific questions then reply to this post and we will do our best to help.
Gordon