Hi Mike,
this is just in reference to the following thread: https://opentuition.com/topic/judicially-implied-terms/
I understand now that you mean to start using the revision kit from the beginning and during the preliminary study. I thought you had meant to use it only after learning the material. However I am not using any study text except the lecture notes with the lecture.
Thank you for explaining 'business efficacy'. May I also request a similar short explanation of 'trade custom'?