I came across a discussion about some of these shows but cant remember where it was now, but anyway, it was about the junking of THE VOODOO FACTOR / STRANGE WORLD OF PLANET X / and possibly THE TROLLENBERG TERROR in the 80s ? Whilst it is well known that these programmes went out live they probably may have been tele-recorded ,but there it seems to end sadly and if they did exist on tape or film up to that point, why would anyone destroy them when searching for long lost programmes was very much in evidence in the 80s even more so now.I have mentioned before that someone put me in the direction of someone who was said to have some of these episodes, but I never heard no more, not even a reply to say that he did have some episodes or it was the film versions that this person was talking about.I have knowledge that THE VOODOO FACTOR exists in the archives of the BFI.