Apart from the tax rates changes, has there been any other significant changes to the syllabus for the June 2020 exams. One I know of is the mortgage interest changes with the allowable deduction is now 75% rather than 50%.
I didn’t find the guidance on the ACCA website helpful at all.
Although you say that the guidance on the ACCA website was not helpful, the most important document you should use is the Finance Act 2019 technical update written by the TX-UK exam team that you will find in the Technical Articles section in the TX-UK section of the ACCA website. This identifies the changes brought in by FA 2019.