According to Aneurin Glyndwr (aka Assembly Labour researcher David Taylor), "Nats and Tories" are to blame:
It's a real shame that these sensitive souls are so easily offended, and find criticism so hard to take!
Funny that, because a lot of these allegedly "easily offended" persons have made copies of the video - just in case it should disappear. In the words of a friend of mine:
...just in case that unforgettable pearl of a video should disappear - depriving Wales' cultural tradition of one of its masterpieces, I have made a copy so that I can continue to enjoy it - over and over and over again.
Here it is again, dedicated to Peter Hain, Eluned Morgan and of course David Taylor.
PS Vaughan Roderick reminds us that the video is also available on the BBC's website.