I love your videos. May I respectfully make one small suggestion. There are several jumps or flashes during each video. I assume that this represents a break and restart in the recording. They are not particularly dusturbing and do not in and of themselves detract much from the presentation. However around each break there is almost no pause in the sound track. That is, the normal pause that would occur between some words and sentences in normal continuous speech is not not present. This tends to draw more attention to the break rather than less. There is a "rapid fire" feel to it. Perhaps this is intentional; a technique to add intensity to the presentation. I will admit that one certainly does not get bored waiting between different points that are being made.
All this is a small quibble. Your videos are great.
By the way, do you speak Welsh ?