Very good presentation. I struggled with the accent, but realized after about 10 minutes that you were really on target with practical knowledge and it was valuable that you mentioned the time and effort involved in various stages.
Very well articulated. I am however not sure if A.18 really relates to Pre-audit and External Audit. I believe it relates to regulatory and contractual obligations, intellectual property rights , etc.
There is Nothing called "A4", it started from "A5" to keep some similarity in numbering with the ISO/IEC 27002 (Code of Practice) Standard's claude numbers.