https://www.youtube.com/playlist?list=P ... X3UCSLGO2X
I'll keep this up-to-date with videos of any new demos that get released. It was also an opportunity for me to do new captures at 50Hz from real hardware for some of the old CRTC demos, including tracking down the previously unreleased version of The Master of Your Old School that has the music fixed.
Finally, a plug for the unofficial BBC demo archive maintained on the Bitshifters website. We try to collect any demos released by others and make them available for download and emulation, including links to code sources where available: https://bitshifters.github.io/archive.html.
Enjoy!