If you are watching the free lectures, then the lectures together with the lecture notes are sufficient. It is in the lectures that I explain and expand on the lecture notes.
The lecture notes are not to be used on their own, and if you are not watching the lectures for any reason then you need to study from a textbook.
If you are watching the lectures then you do not need a textbook (only a Revision Kit because question practice is so vital if you are to pass the exam).