EdwardUK

I moved to UK from Hong Kong in late August 2021. I am not sure if I need to fill in tax return for the items mentioned below. (1) Do I need to disclose what I have saved/earned from Mandatory Provident Fund (MPF) but I have never cashed out? (2) Do I need to disclose the interests what I have earned from the saving account of the banks in Hong Kong?; (3) Do I need to disclose the interests what I have earned from the shares in Hong Kong but I have never cahsed out? (4) Since I have not filled in any tax return for the previous financial years in UK, how could I work back my tax return, if needed? Thank you.