Happy to help! I am making the videos because I think students can benefit greatly from not simply seeing the answers to questions, but seeing them worked out in detail. I also do try to explain some of the theory behind questions when I can fit it in. In any case, glad you can benefit from them. I'm working on the Paper 2 B-questions (the four B questions, where you choose 2 of the four to solve).
I'll solve all of them just for fun, and I think I'll also do the Paper 3 for that exam. I plan on going over the Astrophysics option, as well as Relativity. Those are the ones I've most recently done with my class. I went over those ones with my Oxford students as well (worked as a tutor for one of the Oxford study courses people can take during Easter - that was certainly fun)
Cheers,
Mitch