Would you believe me if I told you that the VT editor was Grant Goodwin, who just happens to be married to my younger sister. There are a lot of outtakes people have never seen, every time they had a good take if the cameras were still rolling Zippy and Bungle became naughty puppets. Every Christmas,the Vt editors would put together some of the outtakes and show them at the staff Christmas party. So Analoguesat is quite correct when he says it was for the Thames TV staff at Christmas.
Have any of you ever seen the It'll be Alright on the Night show wher a magician is trying to fool a little boy with a card trick, but the little boy picks up on how the trick is done and says "no there are four cards , not three". That is Grants son Murray, who had gone to the studios with his mum to pick up his dad from work. They needed a child for the programme and grabbed Murray. Unfortunately for the magician Murray was a really bright kid. I have seen the whole recording of the shoot and it is hilarious, just before he walks off in disgust the magician is heard to say "That was my career Murray!" They showed all that recording at one Christams party as well.