The concept was copied from the FAA. If you do not comply, then the NAA has every right to reject any licence application that is not appropriatedly signed. It is then the student who suffers. If every instructor signs at the end of each lesson, then the instructor knows the training is correctly entered in the log book and the flight is valid for licence or rating issue. Dear old Ron Campbell used to recommend this many years ago.
Last edited by Whopity; 9th Mar 2019 at 11:04.