Hi riversong
We cannot comment on the backpay as we do not have enough information, we would advise you to seek helpfrom your local Welfare Rights Organisation;
advicelocal.uk As a general rule the assessment period starts from when you hand in a fit note, we would advise claimants to make a note on their journal when you hand in a fit note.
The assessment period is 13 weeks from when your fit note is handed in. What this means is that your claim will not be backdated during this period, your backdate should start from the 14 week when you handed in your fit note.
Gary