After reading all the info, I'm still totally confused (even though it's my 4th year doing this!).
Is the final amount of loan for Student Year Sep 2022 to Jun 2023 actually based on FY April 2022 to Mar 2023?
The Student Finance England form asks for income information from FY Apr 2021 to Mar 2022 (as that year is finished), and bases the loan on this. However, do they adjust when HMRC has the figures for FY Apr 2022 to Mar 2023, which overlaps with the student year?