there is no time limit if your getting income support income related ESA pension credit from the new gov*uk site

If found fit for work and you appeal you get assessement rate paid If awarded wrag and appeal you get full money paid I am in same situation as OP and thats what i get

atos make the prognosis and pass it to dwp dm to decide so atos dont know what group he has decided and that will not be on the same day as atos decision

dont admit anything wait until they ask you and just answer their questions honestly, making a list will not really help you because they have their own questions and will ask it in diffrent ways to see if you give same answers that you gave earlier they will have every form you ever filled in for them they will also have access to your bank account and credit cards and every payment they ever made you so they know every penny you have spent also your ex's they will want to know if he knew or made you do it thats why they might want to see him. my other half did something similar before and we had to go to court they only prosecuted her as they couldnt prove i knew about it the amount was over 3000 she got a tag for three months and we had to repay the amount and still are at 10 pounds a week hope that helps to clear it abit for you