If you have any experience applying for PIP or ESA then your experience could be helpful here:-
https://committees.parliament.uk/work/1468/health-assessments-for-benefits/news/158609/mps-want-to-hear-your-experiences-of-applying-for-pip-and-esa/
I have been told that there is a deadline of the 19th May 2021 although I could not see a date when I was looking.
Lots of our members have struggled to fill in the forms themselves and it has caused lots of health issues just completing the forms. Many of us also feel that we have not been given fair or appropriate scores for ME/CFS nor that our assessors were fair and impartial.
With Long Covid there are also additional issues in terms of no-one really knowing how long the symptoms will last for and whether the current benefit system can treat their issues in an appropriate way.
Ben