Non Resident Landlord and Self Assessment

2022 - 2023 is the first time I have done my taxes, after realizing that my accountant was not taking into account my expenses. I need to submit amendments for the following years: 2020 – 2021; and 2019 – 2020 The tax office used by my accountant is: Chapel Wharf Area Trinity Bridge House 2Dearmans Place Salford M3 5BS Do I send the amendments to this address? What explanation do I need to add to the amendment? Thank you. Shirmel Duggins