I’ve just been sent the link to this YouTube page and… Oh… My… God. I once spent an entire summer recording all of our VHS tapes onto the computer so that we had a digital copy. It took forever and although I didn’t actively watch them, I had to keep the sound on so I could catch the end of each episode. From the looks of this YouTube account, I needn’t have bothered!
If you look under Lammas Science playlists, you get collections of videos divided into different KS4 units (B2, C4, etc), there are Bitesize collections, other BBC show colelctions (Wonders of, for example) and broader topics (like forensics, pyrotechnics).
Easily an important site to bookmark, and view whenever needed. The fact that videos are labelled with relevant titles, especially linking them to specific KS4 units is what is most helpful!